Fig. 4.
Spectral energy distribution (SED) of PKS 1510–089 during the low state (red filled points and shaded magenta region) compared to historical measurements (open symbols): high state in March 2009 (gray stars, H.E.S.S. Collaboration 2013), high state in February–March 2012 (black diamonds, Aleksić et al. 2014), flare in May 2015 (blue crosses, Ahnen et al. 2017a), and flare in May 2016 (magenta squares, Zacharias et al. 2017b). The spectra are not deabsorbed from the EBL extinction.
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