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Fig. 5
Same as Fig. 4 for the logarithm of the [N ii](λ6583+λ6548)/ [O i](λ6300+λ6363) line ratio. The superposed cyan and red contours indicate the [O i]λ6363 and the [N ii]λ6583 emission at 3σ ([O i]λ6300 = 3 [OII]λ6363 and [N ii]λ6548 = 1/3 [N ii]λ6583 is assumed everywhere, see text).
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