XMM-Newton Science Analysis System
eradial (especget-1.39.2) [xmmsas_20141104_1833-14.0.0]
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The PSF is fit to the radial profile with a linear fit where the
constant is the background and teh linear term is the
normalisation of the PSF to the strength of the source.
The code performs a fit weighted by the inverse of the error
on each data point. The RMS fit statistic is displayed.
XMM-Newton SOC/SSC -- 2014-11-04