Fig. 2
The distribution of θ2 for ON-source events and normalized OFF-source events centered at the nominal position from H.E.S.S. observations of 1RXS J101015.9 − 311909. In the inset: θ2 distribution of the excess at the fitted position of the AGN; the superposed line is a fit of the PSF to the data. The containment radius at 68% of the PSF for the given observation conditions is 0.116° and is shown by the dashed vertical line.
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