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Fig. 9

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Electron densities derived from [S ii] λλ6717/6730 (black filled circles), [O iiλλ3726/3729 (blue triangles), and [Ar ivλλ4711/4740 (red stars) compared to the one derived from [Cl iiiλλ5517/5537. There is a clear correlation between all quantities. The trend ne([Ar iv])  >  ne([Cl iii])  >  ne([S ii])  >  ne([O ii]) is clear. Solid line represents the equality. Pointed, solid, and dashed lines are the fits to the ne([Ar iv]), ne([S ii]), and ne([O ii]) vs. ne([Cl iii]) data points, respectively.

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