Fig. 1
Light curves of Mrk 421 between MJD 55 264 and 55 278, from VHE to radio (including optical polarization). The Whipple data were converted into fluxes above 200 GeV, and the host galaxy contribution was subtracted from the reported optical fluxes. Popt and EVPAopt stand for the polarization degree and the electric vector polarization angle. For details, see text in Sect. 3.
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