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Fig. 11.
[S II] λλ4069, 4076 to [S II] λλ6716, 6731 ratio as function of electron density for different temperatures, together with the [O I] λ5577 to λλ6300, 6364 ratio. The observed [S II] ratio constrains the density to be (1.0–6.3) ×105 cm−3, consistent with the [O I] limit.
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