Comments

• The principle of evigweight ignores the Point Spread Function. It should never be used for analysing point sources.
• Events outside the field of view (flagged as OUT_OF_FOV), outside the CCD (flagged as OUT_OF_CCD_WINDOW), or outside the energy range (flagged as OUTSIDE_THRESHOLDS), get WEIGHT=0. As a result they are automatically ignored when creating images or spectra.