Fig. 1
Distribution of the X-ray fluxes between 0.1 and 2.4 keV and the Fermi/LAT photon indices above 100 MeV for the BL Lac objects population observed by Fermi/LAT (Ackermann et al. 2011). Among the eight sources selected in this paper, those already detected in VHE are in red, the five others are in blue.
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