13.2.19} queffc.f: user-defined QUantum EFFiCiency

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

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

 Function QUEFFC returns a user-defined quantum efficiency for an optical
 photon of the given wavelength or frequency.
 It is activated by OPT-PROP, with 
SDUM
 = SENSITIV, by setting
 the 0th photon sensitivity parameter to a value < -99.
 See option OPT-PROP and Chap. 12} for more information.

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