Spectral energy distribution of 1ES 1101-232 (top), 1ES 0229+200 (middle), and PKS 2155-304 low state data sets (bottom). The H.E.S.S. data (green circles) and the Fermi data (empty circles) are shown. The upper limits on the flux contribution from a PH for the H.E.S.S. data are shown by blue and red arrows (dashed lines are model-dependent and solid lines are model-independent). The Fermi upper limits are shown as black squares. The grey line corresponds to the Halo Model taken from Eungwanichayapant & Aharonian (2009).