Fig. G.1
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Comparison of extinction-corrected C I line ratios with computed ratios taken from Walmsley et al. (2000) that are based on calculations of Escalante & Victor (1990) for both case A and case B recombination theory. Uncertainties on the observed ratios are given by vertical lines that are placed at the derived electron temperature (lower panel) or in the [3.5 – 3.8] x-range (top panel).
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