--- /dev/null
+parabola parabola 0 0 0 30
+extsurf es_parabola parabola 0 0 1
+offset es_parabola_of es_parabola 5
+mkface result es_parabola_of 0 3 0 40
+set MaxFTol 9.9999999999999995e-08
+set MaxETol 1.0920201413103251e-06
+set MaxVTol 1.0920201413103255e-06