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_doctest use vecfor_RPP type(vector) :: pt(1:2) real(R8P) :: a pt(1) = ex pt(2) = ey a = angle(pt(1), pt(2)) print "(F4.2)", a endprogram volatile_doctest