sim_photons_per_coll
sim_photons_per_coll, a floating point number, is used to control the overall flux level of the simulated data. The units are in photons per second per collimator incident on the spacecraft, with a default value of 10000. This is dealt with differently in the new software; in previous versions, sim_photons_per_coll referred to photon counts, after the energy response matrix of the given detector was accounted for, now this number refers to the total photon flux incident before taking the detector response into account. This means that there are fewer counts registered in the new version for the same value of sim_photons_per_coll. This is a scalar. This parameter is ignored if sim_use_spectrum is set. Note that this is the total value of photons per detector, if there are multple sources in the image then the counts are divided up between the sources, photons_per_source=sim_photons_per_coll*model.amplitude/total(model.amplitude) If no control parameters are set, then the simulation will run using sim_photons_per_coll = 1.0e4, as always.