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Fig. 3.
γ-ray lightcurve of M 87 from 2008 to 2016 in the energy range 0.1–300 GeV. A six-month binning is employed. The red line gives a fit with a constant flux, while the shaded areas show the 1σ and 2σ confidence levels, respectively. There is clear evidence for variability. Error bars given are one-sigma error bars.
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