Fig. 6.
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X-ray flux vs. optical magnitude diagram of the sources with reliable redshifts after the visual inspection, except for BLAZARS and Other Galactic sources which have NORMQ ≠ 3. The sources are colour-coded as in Fig. 5. The region between the two lines defines the locus of quasars in this plane, adapted from Maccacaro et al. (1988).
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