Fig. 16.
Absolute distance of the observed [SII] ratio from a value of 1.45 (Δ1.45, blue histogram), corresponding to the low density limit ne = 1 cm−3, and from a value of 1.40 (Δ1.40, orange line), corresponding to a density ne ∼ 30 cm−3, expressed in terms of the error on the line ratio σerr.
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