γ-ray SED of M 87 for the regular and the high HE source state, respectively. The “high state” encompasses Fermi-LAT data from 09/2013 to 03/2014 and the “regular state” refers to the remaining data from 2008–2016. This regular state shows a break in the SED around E ∼ (5−30) GeV, as in Fig. 1, suggestive of an additional HE component. The break appears camouflaged in the high state by flaring above ∼10 GeV. Lines and shaded regions, including VHE data points, indicate published best fit power laws and confidence bands for previous VHE measurements (blue line: H.E.S.S. VHE low state in 2004, Aharonian et al. 2006; black dash-dotted: H.E.S.S. VHE high state in 2005, Aharonian et al. 2006; green dotted: MAGIC VHE high state in February 2008, Albert et al. 2008; black dotted: VERITAS VHE high state in April 2010, Aliu et al. 2012). Despite non-simultaneity, the observed HE spectral variability would now in principle allow matching the HE–VHE states.