Fig. 5.
Pseudo colour-colour diagram comparing the J = 5–4/J = 2–1 and J = 9–8/J = 5–4 intensity ratios of pPNe line wings, compact PNe line wings and the LVG models for different optical depths (solid, dotted and dashed lines), densities (number indicates log10(ntot)) and temperatures (coded as shown in the colour scale). See text for further details.
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