The last two enables a user-defined scan, where a steady-state run is performed for each entry
of the supplied BEAMFILE. BEAMOPT differs from BEAMFILE that it automatically adjust XLAMDS according to the resonance condition and the beam energy, defined in the BEAMFILE.
The BEAMGAM option is similar to BEAMFILE, but overwrites the value of energy with GAMMA0 from the main input file.
Defines the scan range of the selected scan parameter. The parameter is varied between
(1-SVAR) and (1+SVAR) of its initial value. One exception is the scan over ISEED where the random number generator is not reinitialized.