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          The following distributions  are available in CompHEP:

   "CTEQ4m", "MRS(A')", "MRS(G)" describe the density of quarks and gluons
       in proton/anti-proton;
   "Laser photons"  describes the spectrum of photons scattered backward
from the interaction of laser light with the high energy electron beam;
   "Equiv.photons" describes  virtual photon emitted by the charged
particle in the case of small angle scattering.
   "ISR" describes  the effective  spectrum of electrons loosed energy due
to the emission of photons in the electromagnetic field of the other
electron and electron bunch.

    See Manual for the further explanation and needed references.
