XMM-Newton Science Analysis System
eregionanalyse (especget-1.19) [xmmsas_20050815_1803-6.5.0]
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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 EXTENDED
mode (King profile) PSF is used to calculate the fraction assuming
a fixed photon energy of 1.5 keV. This is currently only implemented
for circular source regions, other shapes will give the wrong factor.
XMM-Newton SOC/SSC -- 2005-08-16