Distribution of the optical extinction inferred from the Balmer decrement for the unobscured Sy2. Only 18 sources may be considered as obscured (NH> 4 × 1021cm-2 ↔ AV> 1.8mag) due to a higher G/D ratio than the Galactic even if the maximum observed optical extinction is quite low AV,max ∼ 2.5 mag.
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