open 
arclength
begin section 
begin curve
       18.352  0.0     -0.000
       18.352  0.0     -0.160
       18.351  0.0     -0.320
       18.350  0.0     -0.480
       18.348  0.0     -0.641
       18.345  0.0     -0.801
       18.343  0.0     -0.960
       18.339  0.0     -1.121
       18.335  0.0     -1.280
       18.331  0.0     -1.441
       18.326  0.0     -1.601
       18.320  0.0     -1.760
       18.314  0.0     -1.921
       18.306  0.0     -2.081
       18.299  0.0     -2.251
       18.292  0.0     -2.411
       18.283  0.0     -2.571
       18.274  0.0     -2.730
       18.264  0.0     -2.891
       18.254  0.0     -3.051
       18.244  0.0     -3.220
       18.233  0.0     -3.380
       18.220  0.0     -3.540
       18.209  0.0     -3.700
       18.195  0.0     -3.870
       18.182  0.0     -4.030
       18.168  0.0     -4.190
       18.153  0.0     -4.360
       18.138  0.0     -4.519
       18.122  0.0     -4.689
       18.106  0.0     -4.849
       18.088  0.0     -5.019