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Fig. 6

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EGMF constraints on PKS 2155-304. The dashed blue line depicts the expected fraction of MBC events in the VHE data depending on the EGMF strength, assuming the Franceschini et al. (2008) EBL model. Blue arrows are the maximum fractions of MBC events for the EBL model not to contradict the angular profile data of PKS 2155-304 at a 99% C.L. The expected cascade fraction and the corresponding upper limit from H.E.S.S. data under the assumption of the Primack et al. (2001) EBL model are depicted in red.

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