XMM-Newton Science Analysis System


omsrclistcomb (omsrclistcomb-2.22) [xmmsas_20141104_1833-14.0.0]

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POSERR

This column contains the standard error of the merged source position- ie $(1/n) \sqrt{ \sum_{k=1}^n err_k^2 }$ , where $err_k$ are the position errors of the n individual sources. Note that input errors from the individual source-list files are first converted from pixels to arcsecs.