Distribution of the squared angular distance of γ-ray candidate events around the position of PKS 1510−089. The angular distribution (in terms of θ2, the square of the angular distance between the source position and the reconstructed arrival direction) of events around the position of PKS 1510−089 is shown. On-source (signal+background) events are shown as hatched histogram, whereas the off-source (background) events are shown as points with error bars. The on-source region is defined by a deg2, shown by the vertical dotted line. The dashed curve is the PSF modeled as a Gaussian, and a constant scaled to the average background level.
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