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Fig. 11.


Distribution of fitted background normalisations. The histograms display the fitted normalisation values for all energy bins, i.e. the normalisations are not averaged for each observation here. The grey histogram shows the distribution for the final model and all 4-telescope observations. The coloured histograms display the distribution for the observations that have been used to construct the model, without corrections (red), with interpolation between zenith angle (ϑ) bins (orange), with a correction for atmospheric transparency (blue), and with a correction for optical phases (green). We give the standard deviation of the distributions in the upper right corner of the plot.

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