Intrinsic spectra as measured by MAGIC on the night of the flare. Left: evolution of the spectral index with the line indicating the average value. Right: MAGIC spectra of the source obtained before (red points and magenta shaded region) and after (blue points and cyan shaded region) the break in the light curve. The dashed line shows the Crab nebula spectrum for a reference (Aleksić et al. 2015).
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