
par1  frame time (in seconds) 
par2  maximum number of photons to pile up 
par3  grade correction for single photon detection 
par4  grade morphing parameter (good grade fraction is assumed proportional to par4 where p is the number of piled photons) 
par5  PSF fraction. Only this fraction will be treated for pileup. Note that this is not the fraction of the PSF included in the extraction region but is the fraction of counts in the region which are from the point source whose pileup is being modeled. For this model to work well the extraction region should be large enough to contain essentially all the PSF. 
par6  Number of regions. The counts to be piledup will be distributed among par6 regions, which will be piledup independently. 
par7  Value of FRACEXPO keyword in ARF. 
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Last modified: Tuesday, 28May2024 10:09:22 EDT