13.2.4} dffcff.f: user-defined DiFFusion CoeFFicient

 ----------------------------------------------------

     Argument list (all variables are input only):
          WVLNGT : photon wavelength (in cm)
          OMGPHO : angular frequency (omega = 2pi nu) of the photon (in s-1)
          MMAT   : material index

 Function DFFCFF returns a user-defined diffusion coefficient for optical photons.
 It is activated by setting 
WHAT(3)
 < -99 in command OPT-PROP, with 
SDUM
 = blank.
 See option OPT-PROP and Chap. 12} for more information.

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