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Fig. 4

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Four images showing examples of the optical spectra of 3PBC counterparts identified in our refined analysis. Top left: Type I Seyfert galaxy 3PBCJ1201.2-0340. Top right: Type II Seyfert galaxy 3PBCJ0325.4-0606. Middle left: Flat spectrum radio quasar (fsrq) 3PBCJ0948.8+0021. Middle right: BL Lac object 3PBCJ1031.1+5053 (BZB in Roma-BZCAT Massaro et al. 2009 nomenclature).

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