Number of events for observation 47829 at final selection level, as a function of right-ascension (J2000). The observation is part of the PKS 2155−304 (steady) data set. We show all events with declination |δ − δpnt|< 0.7 deg, where δpnt is the declination coordinate of the pointing position. Black points are the measured data; the prediction of the fitted background model is shown as a blue line. The grey-shaded area marks an exclusion region around the position of PKS 2155−304. The text box in the upper left corner denotes the applied energy threshold as well as the result of a χ2 test for the agreement between the model and the measured data. We show in addition the number of background events obtained from the ring background method for this observation (red line, cf. Sect. 3.1).
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