Fig. 15
Fazio-Stecker relation: energy at which the opacity reach a given τ as a function of redshift. This plot is done for τ = 1 (red solid line), 2 (blue dashed line) and 5 (green dotted line). The data points are the cutoff energy of Mkn 501 (Aharonian et al. 1999), Mkn 421 (Aharonian et al. 2002) and Lac 1ES 1959+650 (Aharonian et al. 2003).
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