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 fun(v)REAL(rp),INTENT(IN)::vREAL(rp)::funREAL(rp)::xx=v/cparams_ss%VTefun=2.0_rp*(1.0_rp/x+x)*EXP(-x**2)/SQRT(C_PI)-ERF(x)/x**2-psi(v)end function fun