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Beamstrahlung
The following lines in whizard.in control the beamstrahlung simulation in the whizard.in files:
USER_spectrum_on = T
USER_spectrum_mode = -2
The first line indicates that a user-supplied function is used to simulate beamstrahlung. A copy of this function can
be found in ftp://ftp-lcd.slac.stanford.edu/ilc/ILC500/StandardModel/whizard-src/user.f90
The absolute value of USER_spectrum_mode determines which beamstrahlung spectrum is used, with the sign +/- indicating
electron/positron beam, respectively.