Nodes of different colours represent the following:
Solid arrows point from a file to a file which it depends on. A file
is dependent upon another if the latter must be compiled before the former
can be.
program volatile_doctestuse vecfor_RPPtype(vector)::pt(0:3)real(R8P)::dpt(0)=5.3*ezpt(1)=expt(2)=eypt(3)=ex-eyd=pt(0)%distance_to_plane(pt1=pt(1),pt2=pt(2),pt3=pt(3))print"(F3.1)",dendprogram volatile_doctest