13.2.26} usfsci.f: USer-defined Fraction for SCIntillation PHotons

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

     Argument list (all variables are input only):
          IP     : ip-th  scintillation emission for material Mmat
          MMAT   : material index

 Function USFSCI returns the number of scintillation photons per deposited
 GeV corresponding to the ip-th scintillation emission for material Mmat.
 It is activated by OPT-PROD, with 
SDUM
 = SCINTILL/SCINT-WVb/SCINT-OM, and
 
WHAT(2)
 < -99.
 See option OPT-PROD and Chap. 12}, and sphspc.f for more information.

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