\input equa-mac.tex
\let\dis=\displaystyle
\def\ph{\phantom{$\Bigg)$}}

\InsertFig -18.000 150.000 {
1 mm unit 2 screenresolution
 28.000  46.000 moveto
 90.000 rotmem 
  0.850 setgray
  26.000 it (e) <c2> acc (quation de Van der Pol) show 
rotrev
  0.000 setgray
 40.000  40.000 moveto 
125.000 100.000 rect  clip  newpath 
 40.000  89.000 moveto 
125.000   0.000 vector 
102.500  40.000 moveto 
100.000  90.000 vector 
102.500  99.000 moveto 
[ 102.500  99.000   101.399  98.934   101.000  98.874   100.621  98.795   
100.263  98.700    99.925  98.588    99.606  98.461    99.306  98.320   
 99.024  98.165    98.732  97.978    98.305  97.645    97.590  96.851   
 97.164  96.111    96.969  95.617    96.852  95.211    96.784  94.882   
 96.739  94.573    96.715  94.306    96.703  94.047    96.703  93.832   
 96.711  93.617    96.726  93.402    96.749  93.188    96.779  92.976   
 96.816  92.764    96.860  92.554    96.911  92.346    96.969  92.139   
 97.032  91.935    97.102  91.734    97.178  91.535    97.259  91.339   
 97.345  91.146    97.437  90.956    97.533  90.770    97.633  90.588   
 97.738  90.409    97.846  90.235    97.958  90.064    98.073  89.898   
 98.190  89.736    98.311  89.578    98.434  89.425    98.559  89.276   
 98.685  89.132    98.813  88.993    98.942  88.859    99.072  88.729   
 99.203  88.604    99.334  88.485    99.465  88.370    99.596  88.259   
 99.727  88.154    99.858  88.054    99.987  87.958   100.116  87.867   
100.243  87.781   100.370  87.700   100.494  87.623   100.618  87.551   
100.739  87.483   100.859  87.420   100.976  87.362   101.092  87.307   
101.205  87.257   101.316  87.211   101.425  87.169   101.531  87.131   
101.635  87.097   101.736  87.067   101.835  87.041   101.931  87.018   
102.024  86.998   102.115  86.982   102.202  86.970   102.287  86.960   
102.369  86.954   102.449  86.951   102.525  86.950   102.599  86.952   
102.670  86.957   102.738  86.965   102.803  86.975   102.865  86.987   
102.925  87.002   102.982  87.019   103.036  87.038   103.088  87.059   
103.137  87.081   103.184  87.106   103.241  87.141   103.317  87.197   
103.468  87.361   103.547  87.501   103.580  87.590   103.599  87.664   
103.611  87.728   103.618  87.782   103.622  87.834   103.623  87.880   
103.622  87.922   103.620  87.963   103.616  88.005   103.611  88.046   
103.605  88.087   103.598  88.128   103.589  88.169   103.579  88.209   
103.568  88.249   103.556  88.288   103.543  88.327   103.529  88.366   
103.514  88.404   103.498  88.441   103.482  88.478   103.465  88.514   
103.447  88.549   103.428  88.584   103.409  88.618   103.390  88.651   
103.369  88.684   103.349  88.716   103.328  88.747   103.306  88.777   
103.285  88.807   103.263  88.836   103.241  88.863   103.218  88.890   
103.196  88.917   103.173  88.942   103.150  88.967   103.127  88.990   
103.104  89.013   103.082  89.035   103.059  89.056   103.036  89.077   
103.013  89.096   102.991  89.115   102.969  89.133   102.946  89.149   
102.924  89.166   102.903  89.181   102.881  89.196   102.860  89.209   
102.839  89.222   102.818  89.234   102.798  89.246   102.778  89.257   
102.758  89.266   102.739  89.276   102.720  89.284   102.702  89.292   
102.684  89.299   102.666  89.306   102.649  89.312   102.632  89.317   
] scurve 
102.500  99.000 moveto 
[ 102.500  99.000   103.725  98.930   104.146  98.877   104.579  98.808   
105.025  98.723   105.483  98.621   105.952  98.501   106.431  98.364   
106.918  98.210   107.414  98.037   107.915  97.845   108.419  97.635   
108.926  97.406   109.433  97.158   109.936  96.891   110.434  96.606   
110.924  96.303   111.404  95.981   111.870  95.642   112.321  95.286   
112.753  94.914   113.165  94.526   113.555  94.123   113.920  93.706   
114.261  93.276   114.574  92.833   114.861  92.380   115.120  91.917   
115.352  91.444   115.556  90.963   115.733  90.476   115.884  89.982   
116.010  89.483   116.110  88.980   116.188  88.473   116.242  87.964   
116.276  87.454   116.289  86.943   116.282  86.431   116.258  85.920   
116.217  85.410   116.159  84.903   116.087  84.397   116.000  83.895   
115.899  83.396   115.785  82.901   115.659  82.410   115.522  81.924   
115.373  81.444   115.213  80.969   115.043  80.501   114.863  80.039   
114.673  79.584   114.473  79.136   114.264  78.695   114.045  78.263   
113.806  77.820   113.507  77.302   113.156  76.743   112.690  76.070   
112.026  75.225   111.260  74.397   110.424  73.641   109.509  72.964   
108.507  72.373   107.406  71.878   106.377  71.538   105.470  71.321   
104.616  71.179   103.866  71.098   103.080  71.053   102.407  71.043   
101.725  71.059   101.018  71.101   100.287  71.170    99.534  71.266   
 98.760  71.390    97.967  71.543    97.159  71.727    96.340  71.940   
 95.514  72.184    94.687  72.458    93.865  72.763    93.055  73.099   
 92.263  73.464    91.497  73.858    90.763  74.280    90.068  74.728   
 89.416  75.202    88.812  75.699    88.259  76.217    87.758  76.755   
 87.312  77.310    86.918  77.881    86.576  78.466    86.285  79.062   
 86.040  79.668    85.839  80.283    85.680  80.904    85.558  81.530   
 85.470  82.160    85.414  82.793    85.385  83.428    85.382  84.063   
 85.401  84.698    85.441  85.331    85.499  85.963    85.574  86.593   
 85.663  87.219    85.765  87.842    85.880  88.460    86.005  89.075   
 86.140  89.684    86.285  90.289    86.438  90.887    86.599  91.480   
 86.768  92.067    86.943  92.647    87.125  93.221    87.313  93.788   
 87.508  94.348    87.709  94.900    87.915  95.445    88.127  95.983   
 88.345  96.512    88.569  97.033    88.799  97.545    89.035  98.049   
 89.276  98.544    89.524  99.030    89.778  99.507    90.099 100.079   
 90.436 100.646    90.848 101.296    91.355 102.032    91.995 102.870   
 92.794 103.786    93.654 104.627    94.583 105.387    95.592 106.059   
 96.693 106.635    97.853 107.092    98.880 107.387    99.777 107.571   
100.623 107.690   101.425 107.758   102.203 107.788   102.902 107.786   
103.627 107.758   104.378 107.702   105.153 107.618   105.950 107.505   
106.768 107.362   107.604 107.188   108.452 106.983   109.310 106.746   
110.169 106.478   111.026 106.177   111.871 105.845   112.698 105.482   
113.500 105.089   114.268 104.667   114.997 104.216   115.681 103.740   
116.314 103.239   116.893 102.716   117.417 102.172   117.884 101.609   
118.295 101.031   118.651 100.438   118.954  99.833   119.208  99.218   
119.416  98.594   119.581  97.963   119.707  97.327   119.798  96.687   
119.856  96.044   119.886  95.400   119.890  94.754   119.871  94.110   
119.831  93.466   119.773  92.824   119.698  92.184   119.609  91.548   
119.506  90.915   119.392  90.286   119.266  89.662   119.131  89.042   
118.987  88.428   118.835  87.819   ] scurve 
[ 118.835  87.819   118.675  87.216   118.508  86.619   118.334  86.028   
118.154  85.444   117.967  84.867   117.775  84.297   117.577  83.734   
117.373  83.178   117.164  82.630   116.949  82.090   116.729  81.558   
116.503  81.034   116.272  80.519   116.035  80.013   115.792  79.515   
115.543  79.026   115.288  78.547   114.966  77.972   114.629  77.402   
114.224  76.761   113.728  76.035   113.131  75.243   112.367  74.348   
111.516  73.492   110.597  72.717   109.601  72.028   108.516  71.433   
107.327  70.941   106.292  70.629   105.385  70.430   104.510  70.299   
103.715  70.224   102.911  70.187   102.215  70.185   101.493  70.209   
100.745  70.260    99.973  70.339    99.178  70.448    98.362  70.586   
 97.528  70.755    96.680  70.955    95.823  71.187    94.962  71.450   
 94.104  71.746    93.255  72.073    92.423  72.432    91.617  72.821   
 90.842  73.239    90.105  73.685    89.414  74.158    88.772  74.656   
 88.184  75.176    87.651  75.717    87.175  76.277    86.756  76.854   
 86.391  77.445    86.080  78.048    85.818  78.662    85.603  79.285   
 85.432  79.915    85.301  80.551    85.205  81.191    85.142  81.834   
 85.108  82.479    85.101  83.124    85.117  83.769    85.154  84.414   
 85.209  85.056    85.281  85.697    85.369  86.334    85.469  86.967   
 85.582  87.597    85.706  88.223    85.840  88.843    85.982  89.459   
 86.133  90.069    86.292  90.673    86.458  91.271    86.631  91.863   
 86.811  92.449    86.996  93.027    87.187  93.599    87.385  94.163   
 87.587  94.720    87.796  95.270    88.010  95.811    88.229  96.345   
 88.454  96.870    88.684  97.387    88.920  97.895    89.162  98.394   
 89.410  98.885    89.664  99.366    89.972  99.922    90.308 100.495   
 90.694 101.115    91.166 101.816    91.757 102.616    92.484 103.488   
 93.324 104.358    94.229 105.148    95.210 105.854    96.279 106.466   
 97.447 106.978    98.512 107.321    99.448 107.539   100.348 107.684   
101.136 107.766   101.964 107.810   102.656 107.818   103.373 107.799   
104.116 107.752   104.883 107.678   105.674 107.575   106.487 107.443   
107.318 107.279   108.163 107.085   109.019 106.859   109.880 106.601   
110.739 106.311   ] scurve 
102.500  79.000 moveto 
[ 102.500  79.000   103.601  79.066   104.000  79.126   104.379  79.205   
104.737  79.300   105.075  79.412   105.394  79.539   105.694  79.680   
105.976  79.835   106.268  80.022   106.695  80.355   107.410  81.149   
107.836  81.889   108.031  82.383   108.148  82.789   108.216  83.118   
108.261  83.427   108.285  83.694   108.297  83.953   108.297  84.168   
108.289  84.383   108.274  84.598   108.251  84.812   108.221  85.024   
108.184  85.236   108.140  85.446   108.089  85.654   108.031  85.861   
107.968  86.065   107.898  86.266   107.822  86.465   107.741  86.661   
107.655  86.854   107.563  87.044   107.467  87.230   107.367  87.412   
107.262  87.591   107.154  87.765   107.042  87.936   106.927  88.102   
106.810  88.264   106.689  88.422   106.566  88.575   106.441  88.724   
106.315  88.868   106.187  89.007   106.058  89.141   105.928  89.271   
105.797  89.396   105.666  89.515   105.535  89.630   105.404  89.741   
105.273  89.846   105.142  89.946   105.013  90.042   104.884  90.133   
104.757  90.219   104.630  90.300   104.506  90.377   104.382  90.449   
104.261  90.517   104.141  90.580   104.024  90.638   103.908  90.693   
103.795  90.743   103.684  90.789   103.575  90.831   103.469  90.869   
103.365  90.903   103.264  90.933   103.165  90.959   103.069  90.982   
102.976  91.002   102.885  91.018   102.798  91.030   102.713  91.040   
102.631  91.046   102.551  91.049   102.475  91.050   102.401  91.048   
102.330  91.043   102.262  91.035   102.197  91.025   102.135  91.013   
102.075  90.998   102.018  90.981   101.964  90.962   101.912  90.941   
101.863  90.919   101.816  90.894   101.759  90.859   101.683  90.803   
101.532  90.639   101.453  90.499   101.420  90.410   101.401  90.336   
101.389  90.272   101.382  90.218   101.378  90.166   101.377  90.120   
101.378  90.078   101.380  90.037   101.384  89.995   101.389  89.954   
101.395  89.913   101.402  89.872   101.411  89.831   101.421  89.791   
101.432  89.751   101.444  89.712   101.457  89.673   101.471  89.634   
101.486  89.596   101.502  89.559   101.518  89.522   101.535  89.486   
101.553  89.451   101.572  89.416   101.591  89.382   101.610  89.349   
101.631  89.316   101.651  89.284   101.672  89.253   101.694  89.223   
101.715  89.193   101.737  89.164   101.759  89.137   101.782  89.110   
101.804  89.083   101.827  89.058   101.850  89.033   101.873  89.010   
] scurve 
102.500  79.000 moveto 
[ 102.500  79.000   101.275  79.070   100.854  79.123   100.421  79.192   
 99.975  79.277    99.517  79.379    99.048  79.499    98.569  79.636   
 98.082  79.790    97.586  79.963    97.085  80.155    96.581  80.365   
 96.074  80.594    95.567  80.842    95.064  81.109    94.566  81.394   
 94.076  81.697    93.596  82.019    93.130  82.358    92.679  82.714   
 92.247  83.086    91.835  83.474    91.445  83.877    91.080  84.294   
 90.739  84.724    90.426  85.167    90.139  85.620    89.880  86.083   
 89.648  86.556    89.444  87.037    89.267  87.524    89.116  88.018   
 88.990  88.517    88.890  89.020    88.812  89.527    88.758  90.036   
 88.724  90.546    88.711  91.057    88.718  91.569    88.742  92.080   
 88.783  92.590    88.841  93.097    88.913  93.603    89.000  94.105   
 89.101  94.604    89.215  95.099    89.341  95.590    89.478  96.076   
 89.627  96.556    89.787  97.031    89.957  97.499    90.137  97.961   
 90.327  98.416    90.527  98.864    90.736  99.305    90.955  99.737   
 91.194 100.180    91.493 100.698    91.844 101.257    92.310 101.930   
 92.974 102.775    93.740 103.603    94.576 104.359    95.491 105.036   
 96.493 105.627    97.594 106.122    98.623 106.462    99.530 106.679   
100.384 106.821   101.134 106.902   101.920 106.947   102.593 106.957   
103.275 106.941   103.982 106.899   104.713 106.830   105.466 106.734   
106.240 106.610   107.033 106.457   107.841 106.273   108.660 106.060   
109.486 105.816   110.313 105.542   111.135 105.237   111.945 104.901   
112.737 104.536   113.503 104.142   114.237 103.720   114.932 103.272   
115.584 102.798   116.188 102.301   116.741 101.783   117.242 101.245   
117.688 100.690   118.082 100.119   118.424  99.534   118.715  98.938   
118.960  98.332   119.161  97.717   119.320  97.096   119.442  96.470   
119.530  95.840   119.586  95.207   119.615  94.572   119.618  93.937   
119.599  93.302   119.559  92.669   119.501  92.037   119.426  91.407   
119.337  90.781   119.235  90.158   119.120  89.540   118.995  88.925   
118.860  88.316   118.715  87.711   118.562  87.113   118.401  86.520   
118.232  85.933   118.057  85.353   117.875  84.779   117.687  84.212   
117.492  83.652   117.291  83.100   117.085  82.555   116.873  82.017   
116.655  81.488   116.431  80.967   116.201  80.455   115.965  79.951   
115.724  79.456   115.476  78.970   115.222  78.493   114.901  77.921   
114.564  77.354   114.152  76.704   113.645  75.968   113.005  75.130   
112.206  74.214   111.346  73.373   110.417  72.613   109.408  71.941   
108.307  71.365   107.147  70.908   106.120  70.613   105.223  70.429   
104.377  70.310   103.575  70.242   102.797  70.212   102.098  70.214   
101.373  70.242   100.622  70.298    99.847  70.382    99.050  70.495   
 98.232  70.638    97.396  70.812    96.548  71.017    95.690  71.254   
 94.831  71.522    93.974  71.823    93.129  72.155    92.302  72.518   
 91.500  72.911    90.732  73.333    90.003  73.784    89.319  74.260   
 88.686  74.761    88.107  75.284    87.583  75.828    87.116  76.391   
 86.705  76.969    86.349  77.562    86.046  78.167    85.792  78.782   
 85.584  79.406    85.419  80.037    85.293  80.673    85.202  81.313   
 85.144  81.956    85.114  82.600    85.110  83.246    85.129  83.890   
 85.169  84.534    85.227  85.176    85.302  85.816    85.391  86.452   
 85.494  87.085    85.608  87.714    85.734  88.338   ] scurve 
102.500 119.000 moveto 
[ 102.500 119.000   101.074 118.965   100.018 118.891    99.001 118.778   
 98.020 118.627    97.072 118.440    96.153 118.218    95.259 117.962   
 94.386 117.672    93.527 117.349    92.680 116.995    91.837 116.608   
 90.992 116.190    90.140 115.740    89.211 115.223    88.085 114.569   
 86.894 113.862    85.606 113.095    84.175 112.265    82.532 111.363   
 80.565 110.376    78.073 109.285    74.660 108.057    69.862 106.743   
 63.956 105.579    56.374 104.537    46.913 103.652    35.702 102.939   
] scurve 
102.500 119.000 moveto 
[ 102.500 119.000   103.999 118.964   105.207 118.885   106.452 118.759   
107.730 118.586   109.031 118.364   110.343 118.093   111.653 117.772   
112.945 117.402   114.199 116.984   115.399 116.520   116.527 116.011   
117.568 115.462   118.512 114.875   119.353 114.255   120.086 113.605   
120.715 112.929   121.243 112.231   121.678 111.515   122.028 110.785   
122.303 110.042   122.510 109.291   122.661 108.533   122.761 107.770   
122.820 107.004   122.842 106.236   122.835 105.469   122.802 104.702   
122.747 103.937   122.675 103.174   122.587 102.414   122.486 101.658   
122.374 100.906   122.253 100.158   122.123  99.415   121.986  98.677   
121.843  97.944   121.694  97.217   121.541  96.496   121.382  95.780   
121.220  95.070   121.054  94.367   120.884  93.670   120.710  92.980   
120.533  92.296   120.353  91.618   120.170  90.948   119.984  90.285   
119.794  89.629   119.602  88.979   119.406  88.338   119.207  87.703   
119.005  87.077   118.800  86.458   118.591  85.846   118.379  85.243   
118.164  84.648   117.944  84.061   117.721  83.482   117.494  82.912   
117.263  82.351   117.027  81.798   116.788  81.254   116.543  80.720   
116.294  80.194   116.039  79.678   115.780  79.172   115.515  78.676   
115.200  78.114   114.851  77.523   114.451  76.884   113.974  76.178   
113.365  75.354   112.723  74.577   112.045  73.848   111.325  73.171   
110.560  72.548   109.743  71.984   108.867  71.482   107.926  71.047   
106.912  70.684   105.919  70.421   104.985  70.247   104.194  70.148   
103.363  70.088   102.635  70.068   101.912  70.076   101.162  70.112   
100.385  70.178    99.584  70.272    98.760  70.398    97.915  70.555   
 97.054  70.744    96.181  70.966    95.301  71.221    94.422  71.509   
 93.549  71.831    92.692  72.185    91.858  72.571    91.054  72.988   
 90.289  73.434    89.569  73.909    88.900  74.410    88.285  74.935   
 87.728  75.482    87.230  76.049    86.791  76.634    86.410  77.234   
 86.084  77.847    85.811  78.472    85.587  79.106    85.408  79.748   
 85.271  80.396    85.172  81.048    85.106  81.703    85.072  82.361   
 85.064  83.019    85.081  83.676    85.119  84.333    85.176  84.988   
 85.251  85.640    85.341  86.290    85.445  86.935    85.561  87.577   
 85.689  88.214    85.826  88.846    85.973  89.472    86.128  90.093   
 86.291  90.708    86.461  91.316    86.639  91.918    86.822  92.513   
 87.012  93.102    87.209  93.682    87.411  94.256    87.618  94.821   
 87.832  95.379    88.051  95.928    88.276  96.469    88.506  97.002   
 88.743  97.525    88.985  98.040    89.233  98.545    89.487  99.041   
 89.747  99.528    90.070 100.100    90.415 100.678    90.829 101.328   
 91.337 102.062    91.949 102.863    92.596 103.617    93.282 104.322   
 94.096 105.046    95.084 105.775    96.160 106.409    97.339 106.940   
 98.414 107.297    99.361 107.525   100.253 107.675   101.051 107.763   
101.874 107.811   102.574 107.821   103.301 107.805   104.054 107.761   
104.833 107.687   105.637 107.584   106.463 107.450   107.308 107.285   
] scurve 
102.500 134.000 moveto 
[ 102.500 134.000   100.641 133.960    98.979 133.855    97.375 133.684   
 95.819 133.452    94.298 133.160    92.795 132.808    91.292 132.397   
 89.765 131.926    88.187 131.395    86.519 130.799    84.711 130.136   
 82.687 129.398    80.326 128.574    77.420 127.648    73.560 126.590   
 68.060 125.397    61.348 124.325    52.509 123.333    42.059 122.532   
 30.446 121.916   ] scurve 
102.500 134.000 moveto 
[ 102.500 134.000   104.441 133.959   106.316 133.846   108.245 133.659   
110.207 133.394   112.173 133.053   114.104 132.634   115.958 132.141   
117.691 131.578   119.266 130.949   120.656 130.262   121.847 129.524   
122.837 128.744   123.638 127.928   124.268 127.084   124.749 126.218   
125.104 125.336   125.356 124.442   125.523 123.540   125.623 122.633   
125.671 121.723   125.676 120.812   125.648 119.901   125.594 118.992   
125.520 118.086   125.430 117.182   125.328 116.283   125.215 115.388   
125.094 114.497   124.967 113.611   124.834 112.731   124.697 111.856   
124.556 110.986   124.412 110.121   124.264 109.263   124.114 108.410   
123.962 107.564   123.808 106.723   123.651 105.888   123.493 105.060   
123.332 104.238   123.170 103.422   123.006 102.613   122.840 101.810   
122.673 101.013   122.503 100.224   122.332  99.441   122.158  98.665   
121.983  97.895   121.806  97.133   121.627  96.377   121.445  95.629   
121.262  94.888   121.076  94.154   120.888  93.427   120.698  92.708   
120.505  91.997   120.310  91.293   120.112  90.596   119.912  89.908   
119.709  89.227   119.503  88.555   119.293  87.891   119.081  87.235   
118.866  86.587   118.647  85.948   118.425  85.317   118.199  84.696   
117.969  84.083   117.735  83.480   117.497  82.885   117.255  82.301   
117.009  81.725   116.757  81.160   116.501  80.604   116.239  80.059   
115.972  79.524   115.699  79.000   115.420  78.487   115.095  77.917   
114.728  77.307   114.306  76.649   113.779  75.892   113.132  75.050   
112.448  74.260   111.723  73.524   110.950  72.845   110.125  72.227   
109.240  71.675   108.287  71.194   107.258  70.789   106.227  70.486   
105.273  70.286   104.463  70.170   103.610  70.094   102.879  70.064   
102.135  70.063   101.361  70.093   100.558  70.153    99.728  70.246   
 98.873  70.372    97.995  70.531    97.099  70.726   ] scurve 
102.500  59.000 moveto 
[ 102.500  59.000   103.926  59.035   104.982  59.109   105.999  59.222   
106.980  59.373   107.928  59.560   108.847  59.782   109.741  60.038   
110.614  60.328   111.473  60.651   112.320  61.005   113.163  61.392   
114.008  61.810   114.860  62.260   115.789  62.777   116.915  63.431   
118.106  64.138   119.394  64.905   120.825  65.735   122.468  66.637   
124.435  67.624   126.927  68.715   130.340  69.943   135.138  71.257   
141.044  72.421   148.626  73.463   158.087  74.348   169.298  75.061   
] scurve 
102.500  59.000 moveto 
[ 102.500  59.000   101.001  59.036    99.793  59.115    98.548  59.241   
 97.270  59.414    95.969  59.636    94.657  59.907    93.347  60.228   
 92.055  60.598    90.801  61.016    89.601  61.480    88.473  61.989   
 87.432  62.538    86.488  63.125    85.647  63.745    84.914  64.395   
 84.285  65.071    83.757  65.769    83.322  66.485    82.972  67.215   
 82.697  67.958    82.490  68.709    82.339  69.467    82.239  70.230   
 82.180  70.996    82.158  71.764    82.165  72.531    82.198  73.298   
 82.253  74.063    82.325  74.826    82.413  75.586    82.514  76.342   
 82.626  77.094    82.747  77.842    82.877  78.585    83.014  79.323   
 83.157  80.056    83.306  80.783    83.459  81.504    83.618  82.220   
 83.780  82.930    83.946  83.633    84.116  84.330    84.290  85.020   
 84.467  85.704    84.647  86.382    84.830  87.052    85.016  87.715   
 85.206  88.371    85.398  89.021    85.594  89.662    85.793  90.297   
 85.995  90.923    86.200  91.542    86.409  92.154    86.621  92.757   
 86.836  93.352    87.056  93.939    87.279  94.518    87.506  95.088   
 87.737  95.649    87.973  96.202    88.212  96.746    88.457  97.280   
 88.706  97.806    88.961  98.322    89.220  98.828    89.485  99.324   
 89.800  99.886    90.149 100.477    90.549 101.116    91.026 101.822   
 91.635 102.646    92.277 103.423    92.955 104.152    93.675 104.829   
 94.440 105.452    95.257 106.016    96.133 106.518    97.074 106.953   
 98.088 107.316    99.081 107.579   100.015 107.753   100.806 107.852   
101.637 107.912   102.365 107.932   103.088 107.924   103.838 107.888   
104.615 107.822   ] scurve 
102.500  44.000 moveto 
[ 102.500  44.000   104.359  44.040   106.021  44.145   107.625  44.316   
109.181  44.548   110.702  44.840   112.205  45.192   113.708  45.603   
115.235  46.074   116.813  46.605   ] scurve
102.500  44.000 moveto 
[ 102.500  44.000   100.559  44.041    98.684  44.154    96.755  44.341   
 94.793  44.606    92.827  44.947    90.896  45.366    89.042  45.859   
 87.309  46.422    85.734  47.051    84.344  47.738    83.153  48.476   
 82.163  49.256    81.362  50.072    80.732  50.916    80.251  51.782   
 79.896  52.664    79.644  53.558    79.477  54.460    79.377  55.367   
 79.329  56.277    79.324  57.188    79.352  58.099    79.406  59.008   
 79.480  59.914    79.570  60.818    79.672  61.717    79.785  62.612   
 79.906  63.503    80.033  64.389    80.166  65.269    80.303  66.144   
 80.444  67.014    80.588  67.879    80.736  68.737    80.886  69.590   
 81.038  70.436    81.192  71.277    81.349  72.112    81.507  72.940   
 81.668  73.762    81.830  74.578    81.994  75.387    82.160  76.190   
 82.327  76.987    82.497  77.776    82.668  78.559    82.842  79.335   
 83.017  80.105    83.194  80.867    83.373  81.623    83.555  82.371   
 83.738  83.112    83.924  83.846    84.112  84.573    84.302  85.292   
 84.495  86.003    84.690  86.707    84.888  87.404    85.088  88.092   
 85.291  88.773    85.497  89.445    85.707  90.109    85.919  90.765   
 86.134  91.413    86.353  92.052    86.575  92.683    86.801  93.304   
 87.031  93.917    87.265  94.520    87.503  95.115    87.745  95.699   
 87.991  96.275    88.243  96.840    88.499  97.396    88.761  97.941   
 89.028  98.476    89.301  99.000    89.580  99.513    89.905 100.083   
 90.272 100.693    90.694 101.351    91.221 102.108   ] scurve 
132.500  89.000 moveto 
[ 132.500  89.000   134.867  89.717   138.048  90.497   142.633  91.365   
149.873  92.347   159.267  93.212   170.370  93.905   ] scurve 
132.500  89.000 moveto 
[ 132.500  89.000   130.651  88.331   129.156  87.700   127.914  87.101   
126.860  86.528   125.950  85.978   124.984  85.329   124.132  84.694   
123.271  83.987   122.460  83.254   121.727  82.533   120.930  81.687   
120.216  80.874   119.563  80.092   118.839  79.187   118.140  78.288   
117.477  77.427   116.840  76.603   116.219  75.814   115.483  74.910   
114.721  74.024   113.952  73.192   113.167  72.414   112.359  71.692   
111.518  71.029   110.639  70.425   109.711  69.886   108.727  69.413   
107.677  69.012   106.553  68.687   105.571  68.482   104.610  68.344   
103.753  68.268   102.855  68.232   102.089  68.233   101.313  68.261   
100.510  68.318    99.683  68.405    98.832  68.521    97.960  68.669   
 97.072  68.848    96.171  69.060    95.263  69.304    94.354  69.581   
 93.453  69.890    92.566  70.232    91.702  70.605    90.868  71.009   
 90.074  71.442    89.325  71.903    88.627  72.390    87.985  72.901   
 87.401  73.434    86.878  73.987    86.414  74.558    86.010  75.144   
 85.662  75.744    85.369  76.355    85.125  76.976    84.928  77.605   
 84.774  78.241    84.658  78.881    84.576  79.525    84.526  80.171   
 84.503  80.818    84.504  81.466    84.528  82.113    84.571  82.759   
 84.631  83.404    84.706  84.045    84.795  84.684    84.895  85.320   
 85.007  85.951    85.128  86.579    85.259  87.202    85.397  87.820   
 85.542  88.433    85.695  89.040    85.853  89.642    86.018  90.239   
 86.188  90.829    86.363  91.413    86.544  91.990    86.729  92.561   
 86.919  93.125    87.114  93.683    87.314  94.233    87.518  94.776   
 87.727  95.311    87.940  95.839    88.158  96.359    88.381  96.871   
 88.608  97.376    88.841  97.871    89.079  98.359    89.322  98.837   
 89.582  99.328   ] scurve 
 72.500  89.000 moveto 
[  72.500  89.000    70.133  88.283    66.952  87.503    62.367  86.635   
 55.127  85.653    45.733  84.788    34.630  84.095   ] scurve 
 72.500  89.000 moveto 
[  72.500  89.000    74.349  89.669    75.844  90.300    77.086  90.899   
 78.140  91.472    79.050  92.022    80.016  92.671    80.868  93.306   
 81.729  94.013    82.540  94.746    83.273  95.467    84.070  96.313   
 84.784  97.126    85.437  97.908    86.161  98.813    86.860  99.712   
 87.523 100.573    88.160 101.397    88.781 102.186    89.517 103.090   
 90.279 103.976    91.048 104.808    91.833 105.586    92.641 106.308   
 93.482 106.971    94.361 107.575    95.289 108.114    96.273 108.587   
 97.323 108.988    98.447 109.313    99.429 109.518   100.390 109.656   
101.247 109.732   102.145 109.768   102.911 109.767   103.687 109.739   
104.490 109.682   105.317 109.595   106.168 109.479   107.040 109.331   
107.928 109.152   108.829 108.940   109.737 108.696   110.646 108.419   
111.547 108.110   112.434 107.768   113.298 107.395   114.132 106.991   
114.926 106.558   115.675 106.097   116.373 105.610   117.015 105.099   
117.599 104.566   118.122 104.013   118.586 103.442   118.990 102.856   
119.338 102.256   119.631 101.645   119.875 101.024   120.072 100.395   
120.226  99.759   120.342  99.119   120.424  98.475   120.474  97.829   
120.497  97.182   120.496  96.534   120.472  95.887   120.429  95.241   
120.369  94.596   120.294  93.955   120.205  93.316   120.105  92.680   
119.993  92.049   119.872  91.421   119.741  90.798   119.603  90.180   
119.458  89.567   119.305  88.960   119.147  88.358   118.982  87.761   
118.812  87.171   118.637  86.587   118.456  86.010   118.271  85.439   
118.081  84.875   117.886  84.317   117.686  83.767   117.482  83.224   
117.273  82.689   117.060  82.161   116.842  81.641   116.619  81.129   
116.392  80.624   116.159  80.129   115.921  79.641   115.678  79.163   
115.418  78.672   115.099  78.098   114.771  77.538   114.371  76.896   
113.901  76.197   113.258  75.330   112.492  74.418   111.670  73.575   
110.787  72.808   109.833  72.121   108.797  71.522   107.667  71.017   
106.594  70.662   105.631  70.430   104.728  70.279   103.947  70.195   
103.147  70.147   102.401  70.136   101.706  70.152   100.987  70.194   
100.244  70.261    99.479  70.356    98.693  70.479   ] scurve 
132.500 105.000 moveto 
[ 132.500 105.000   134.791 105.826   138.003 106.725   142.899 107.728   
150.268 108.764   159.674 109.640   170.611 110.326   ] scurve 
132.500 105.000 moveto 
[ 132.500 105.000   130.775 104.227   129.424 103.494   128.336 102.793   
127.437 102.119   126.634 101.422   125.849 100.634   125.174  99.853   
124.480  98.926   123.893  98.025   123.385  97.148   122.937  96.290   
122.534  95.450   122.166  94.626   121.825  93.816   121.506  93.020   
121.203  92.237   120.913  91.467   120.632  90.708   120.360  89.961   
120.093  89.224   119.830  88.499   119.569  87.785   119.311  87.082   
119.053  86.389   118.795  85.707   118.536  85.035   118.276  84.375   
118.013  83.725   117.748  83.086   117.480  82.459   117.208  81.842   
116.933  81.237   116.653  80.644   116.368  80.062   116.078  79.492   
115.782  78.934   115.480  78.389   115.158  77.832   114.762  77.185   
114.316  76.504   113.748  75.704   113.051  74.820   112.311  73.994   
111.525  73.229   110.684  72.531   109.782  71.903   108.810  71.352   
107.757  70.882   106.657  70.514   105.672  70.275   104.814  70.130   
103.944  70.034   103.199  69.989   102.422  69.976   101.611  69.996   
100.769  70.050    99.895  70.140    98.992  70.267    98.064  70.432   
 97.114  70.636    96.150  70.879    95.177  71.163    94.206  71.487   
 93.246  71.852    92.308  72.256    91.402  72.698    90.538  73.177   
 89.727  73.691    88.976  74.237    88.291  74.813    87.676  75.416   
 87.133  76.043    86.661  76.691    86.259  77.358    85.924  78.039   
 85.651  78.734    85.435  79.438    85.271  80.150    85.154  80.868   
 85.079  81.590    85.041  82.315    85.036  83.040    85.059  83.765   
 85.109  84.488    85.180  85.209    85.271  85.927    85.380  86.640   
 85.504  87.348    85.642  88.051    85.793  88.748    85.954  89.439   
 86.126  90.122    86.307  90.799    86.497  91.467   ] scurve 
132.500 120.000 moveto 
[ 132.500 120.000   134.687 120.964   137.920 122.010   143.203 123.185   
150.233 124.215   159.395 125.100   170.273 125.801   ] scurve 
132.500 120.000 moveto 
[ 132.500 120.000   130.925 119.094   129.740 118.230   128.820 117.399   
128.085 116.594   127.425 115.721   126.826 114.765   126.335 113.830   
125.924 112.913   125.571 112.011   125.261 111.121   124.984 110.243   
124.732 109.375   124.499 108.517   124.281 107.667   124.074 106.826   
123.875 105.992   123.683 105.166   123.495 104.347   123.311 103.536   
123.130 102.731   122.950 101.934   122.771 101.143   122.593 100.360   
122.415  99.583   122.236  98.814   122.057  98.051   121.877  97.295   
121.695  96.547   121.513  95.805   121.329  95.070   121.143  94.343   
120.956  93.623   120.766  92.910   120.575  92.205   120.381  91.507   
120.186  90.816   119.987  90.133   119.786  89.458   119.583  88.791   
119.377  88.132   119.168  87.481   118.956  86.838   118.740  86.203   
118.522  85.577   118.300  84.959   118.074  84.350   117.845  83.750   
117.611  83.159   117.374  82.577   117.132  82.004   116.886  81.441   
] scurve 
 72.500  73.000 moveto 
[  72.500  73.000    70.209  72.174    66.997  71.275    62.101  70.272   
 54.732  69.236    45.326  68.360    34.389  67.674   ] scurve 
 72.500  73.000 moveto 
[  72.500  73.000    74.225  73.773    75.576  74.506    76.664  75.207   
 77.563  75.881    78.366  76.578    79.151  77.366    79.826  78.147   
 80.520  79.074    81.107  79.975    81.615  80.852    82.063  81.710   
 82.466  82.550    82.834  83.374    83.175  84.184    83.494  84.980   
 83.797  85.763    84.087  86.533    84.368  87.292    84.640  88.039   
 84.907  88.776    85.170  89.501    85.431  90.215    85.689  90.918   
 85.947  91.611    86.205  92.293    86.464  92.965    86.724  93.625   
 86.987  94.275    87.252  94.914    87.520  95.541    87.792  96.158   
 88.067  96.763    88.347  97.356    88.632  97.938    88.922  98.508   
 89.218  99.066    89.520  99.611    89.842 100.168    90.238 100.815   
 90.684 101.496    91.252 102.296    91.949 103.180    92.689 104.006   
 93.475 104.771    94.316 105.469    95.218 106.097    96.190 106.648   
 97.243 107.118    98.343 107.486    99.328 107.725   100.186 107.870   
101.056 107.966   101.801 108.011   102.578 108.024   103.389 108.004   
104.231 107.950   105.105 107.860   106.008 107.733   106.936 107.568   
107.886 107.364   108.850 107.121   109.823 106.837   110.794 106.513   
111.754 106.148   112.692 105.744   113.598 105.302   114.462 104.823   
115.273 104.309   116.024 103.763   116.709 103.187   117.324 102.584   
117.867 101.957   118.339 101.309   118.741 100.642   119.076  99.961   
119.349  99.266   119.565  98.562   119.729  97.850   119.846  97.132   
119.921  96.410   119.959  95.685   119.964  94.960   119.941  94.235   
119.891  93.512   119.820  92.791   119.729  92.073   119.620  91.360   
119.496  90.652   119.358  89.949   119.207  89.252   119.046  88.561   
118.874  87.878   118.693  87.201   118.503  86.533   118.305  85.872   
118.099  85.220   117.886  84.577   117.666  83.942   117.439  83.317   
117.205  82.702   116.964  82.096   116.716  81.501   ] scurve 
 72.500  58.000 moveto 
[  72.500  58.000    70.313  57.036    67.080  55.990    61.797  54.815   
 54.767  53.785    45.605  52.900    34.727  52.199   ] scurve 
 72.500  58.000 moveto 
[  72.500  58.000    74.075  58.906    75.260  59.770    76.180  60.601   
 76.915  61.406    77.575  62.279    78.174  63.235    78.665  64.170   
 79.076  65.087    79.429  65.989    79.739  66.879    80.016  67.757   
 80.268  68.625    80.501  69.483    80.719  70.333    80.926  71.174   
 81.125  72.008    81.317  72.834    81.505  73.653    81.689  74.464   
 81.870  75.269    82.050  76.066    82.229  76.857    82.407  77.640   
 82.585  78.417    82.764  79.186    82.943  79.949    83.123  80.705   
 83.305  81.453    83.487  82.195    83.671  82.930    83.857  83.657   
 84.044  84.377    84.234  85.090    84.425  85.795    84.619  86.493   
 84.814  87.184    85.013  87.867    85.214  88.542    85.417  89.209   
 85.623  89.868    85.832  90.519    86.044  91.162    86.260  91.797   
 86.478  92.423    86.700  93.041    86.926  93.650    87.155  94.250   
 87.389  94.841    87.626  95.423    87.868  95.996    88.114  96.559   
 88.365  97.113    88.621  97.657    88.882  98.190    89.148  98.714   
 89.420  99.227    89.705  99.741   ] scurve 
128.800 140.000 moveto 
[ 128.800 140.000   128.609 138.558   128.449 137.324   128.290 136.098   
128.132 134.879   127.975 133.667   127.817 132.463   127.660 131.267   
127.501 130.078   127.341 128.896   127.181 127.722   127.019 126.556   
126.856 125.397   126.692 124.247   126.527 123.104   126.360 121.968   
126.192 120.841   126.023 119.722   125.852 118.611   125.680 117.508   
125.506 116.413   125.330 115.326   125.153 114.248   124.975 113.178   
124.794 112.117   124.612 111.065   124.428 110.021   124.242 108.985   
124.055 107.959   ] scurve 
 76.304  38.481 moveto
[ 76.304  38.481    76.462  39.779    76.620  41.068    76.780  42.350   
 76.941  43.624    77.103  44.890    77.267  46.147    77.432  47.397   
 77.598  48.638    77.765  49.871    77.933  51.096    78.103  52.312   
 78.275  53.520    78.448  54.719    78.622  55.910    78.798  57.092   
 78.975  58.265    79.154  59.430    79.335  60.585    79.517  61.731   
 79.701  62.869    79.887  63.997    80.075  65.115    80.264  66.225   
 80.456  67.325    80.650  68.415    80.845  69.496    81.043  70.567   
 81.243  71.628    81.445  72.679    81.650  73.720    81.857  74.751   
 82.066  75.771    82.279  76.781    82.493  77.781    82.711  78.769   
 82.932  79.747    83.155  80.713    83.382  81.669    83.612  82.613   
 83.845  83.546    84.082  84.467    84.323  85.376    84.567  86.273   
 84.816  87.157    85.068  88.030    85.326  88.889    85.587  89.736   
 85.854  90.570    86.125  91.390    86.402  92.197    86.685  92.990   
 86.974  93.768    87.268  94.532    87.570  95.282    87.878  96.016   
 88.194  96.734    88.518  97.437    88.850  98.124    89.191  98.793   
 89.541  99.446    89.902 100.081    90.274 100.697    90.701 101.362   
 91.234 102.127    91.889 102.977    92.582 103.774    93.318 104.515   
 94.102 105.198    94.940 105.818    95.840 106.370    96.811 106.850   
 97.860 107.252    98.869 107.538    99.804 107.728   100.627 107.841   
101.462 107.911   102.188 107.938   102.944 107.936   103.730 107.902
] scurve
102.500 104.000 moveto 
  0.700   0.000 indent 
117.500  89.000 moveto 
  0.700  90.000 indent}
\LabelTeX  162.500  84.500 $x$\ELTX
\LabelTeX   98.500 137.500 $y$\ELTX
\LabelTeX   99.000 102.400 $1$\ELTX
\LabelTeX  129.000  51.500
$\cases{\dis{dx\over dt}=y-x^3+x&\ph\cr \dis{dy\over dt}=-x&\ph\cr}$\ELTX
\EndFig

\end
