XMM-Newton Science Analysis System


eregionanalyse (especget-1.44.1) [xmmsas_20160201_1833-15.0.0]

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Encircled energy factor

The fraction of counts contained within the source region assuming a point source located at the centre of the region. The PSF used to calculate the fraction is defined by the psfmodel parameter at a fixed photon energy of 1.5 keV. This is currently only implemented for circular source regions, other shapes will give the wrong factor.