The [4.6]–/[3.4]–[4.6] MIR color–color plot reporting the positions of γ-ray emitting blazars (in cyan) associated with WISE sources forming the blazar strip (see Massaro et al. 2013a, for more details), together with the BL Lac objects (filled squares) identified in this paper and belonging to the Fermi-ROSAT sample of Stephen et al. (2010). In the diagram, the positions of non-blazar sources in the list of Stephen et al. (2010) are labeled and indicated with open circles. The dashed box indicates the locus of the WISE blazar strip considered by Massaro et al. (2013b) as containing likely TeV-emitting BL Lacs.
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