psi_dyerhicks()

subroutine module_sf_mynn::psi_dyerhicks	(	real, intent(out)	psi_m,
		real, intent(out)	psi_h,
		real, intent(in)	zL,
		real, intent(in)	Zt,
		real, intent(in)	Z_0,
		real, intent(in)	Za
	)