XMM-Newton Science Analysis System


omdetect (omdetect-5.19.4) [xmmsas_20090615_1801-9.0.0]

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Source X and Y coordinates

The position of a source on the image (XPOS and YPOS) are referred to a coordinate origin in which the pixel at the far-left and bottom of the image has coordinates 1.0, 1.0. The source barycentre coordinates are computed using the first-order moments of the intensity profile.