(...) I'm an idiot, but I think I understand now. The larger *sphe.dat files must simply include of a bunch of 1-8sphe.dat instances as type 1 lines. So yes, you only need the type 5 edge lines in the 1-8sphe.dat file if it's made right. Don (23 years ago, 8-May-02, to lugnet.cad.dat.parts.primitives)