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_R4Ptype(vector_R4P)::pt(0:3)pt(1)=ex_R4Ppt(2)=ey_R4Ppt(3)=ex_R4P-ey_R4Ppt(0)=face_normal3_R4P(pt1=pt(1),pt2=pt(2),pt3=pt(3),norm='y')print"(3(F3.1,1X))",abs(pt(0)%x),abs(pt(0)%y),abs(pt(0)%z)endprogram volatile_doctest