parabola parabola 0 0 0 30
revsurf rs_parabola parabola 0 400 0 1 0 0
offset rs_parabola_of rs_parabola 10
offset rs_parabola_of_of rs_parabola_of 5
mkface result rs_parabola_of_of .3 .5 .3 .5
set MaxFTol 9.9999999999999995e-08
set MaxETol 1.5770976546370927e-07
set MaxVTol 1.5770976546370932e-07