Left panel: distribution of absorption column densities for the 35 X-ray detected quasars, derived by HR or spectral analysis. Right panel: AV magnitudes vs. X-ray absorption column densities derived by spectral analysis. The black square represents values of NH= 5 × 1021 cm-2 and AV = 0 for 8 sources (see Table 2). The blue solid line represents the relation obtained by assuming a Galactic dust-to-gas ratio, i.e., AV = 10(log NH−21.278) mag (Maiolino et al. 2001).
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