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: http://xmm.vilspa.esa.es/calibration/documentation/CALHB/node935.html
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The analysis of calibration observations of fields observed in different positions of the detector has demonstrated that large sensitivity variations do not exist in OM data, or they are smaller than the errors of the photometry (a few percent). Therefore this calibration file has been set to unity.
Something similar occurs with pixel to pixel variations (see 4.5.9).
We keep the following description as a guideline for eventual needs that might arise in the future.