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Fig. 6
Top: the spatial profile of the [S ii] lines emission in the 2006 WHT spectra. The solid line is the [S ii]6731 line, and the dashed one the 6717 line. Second panel: the F(6717)/F(6731) line ratio. Third panel: the electron density Ne profile. Bottom row: the corresponding recombination timescales for H, N+, and O2+.
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