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_R8Ptype(vector_R8P)::pt(0:3)real(R8P)::dpt(0)=5.3*ez_R8Ppt(1)=ex_R8Ppt(2)=ey_R8Ppt(3)=ex_R8P-ey_R8Pd=distance_to_plane_R8P(pt(0),pt1=pt(1),pt2=pt(2),pt3=pt(3))print"(F3.1)",dendprogram volatile_doctest