Nodes of different colours represent the following:
Solid arrows point from a procedure to one which it calls. Dashed
arrows point from an interface to procedures which implement that interface.
This could include the module procedures in a generic interface or the
implementation in a submodule of an interface in a parent module.
FUNCTION indicator(psi,psi_max)REAL(rp),INTENT(IN)::psiREAL(rp),INTENT(IN)::psi_maxREAL(rp)::indicatorIF(psi.LT.psi_max)THENindicator=1ELSEindicator=0END IFEND FUNCTION indicator