Fig. 1
Distributions of the θ2 parameter for 1ES 1215+303 signal (black histograms) and background estimation (gray histograms) for the three observation periods: January − February 2010 (left), May − June 2010 (middle), and January − February 2011 (right). The vertical dashed line corresponds to the apriori defined signal region θ2 < 0.01 deg2.
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