Upper limits to the gamma-ray luminosity produced by clouds inside the jet as a function of L_j in FR II sources. Two cases are plotted, one assuming that clouds cross the jet without disruption (green solid lines), and one in which the clouds are destroyed in a time as short as t_cs (green dashed lines). The thick (solid and dashed) and thin (solid and dashed) lines correspond to (Kaspi et al. 2007) and (Kaspi et al. 2005), respectively. In addition, the sensitivity levels of Fermi in the range 0.1–1 GeV (maroon dotted lines) are plotted for three different distances d = 10, 100, and 1000 Mpc.