Fig. 1.
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Theta-squared distribution of data taken between 2015 June 15 and 28 (left) and on 2015 June 15 (right). Excess events are shown with filled circles, highlighted with blue crosses, and the normalized off-source events are shown with a grey histogram. The energy threshold is ∼70 GeV. The vertical dashed line marks the limit of the signal region at θ2 = 0.02°.
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