Constraints on (Emax,p,γp) deduced in the pγ model, assuming T = 104 K for different sources in Table 1. The excluded regions lie above the curves. From top to bottom, the constrains are obtained for the sources: AO 0235+164, PG 1553+113, 3C 454.3, PKS 1502+106 and 3C 273. Best constraint is from 3C 273.
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