Distributions of χ2 statistic values. We show results for all 4-telescope observations (grey, filled histograms) and those used in the construction of the background model (green histograms). Distributions are shown for a slice along the right-ascension (top) and declination (bottom) axis (see main text for details). Displayed is the χ2 probability (left) and the corresponding significance in terms of standard deviations of a normal distribution (right). The fitted mean (μ) and width (σ) of the significance distributions are indicated as well.
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