Fig. 13
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Excitation temperature of Fe II in the December 6, 1997 comet, as a function of the RV. The temperatures were estimated by building excitation diagrams similar to Fig. 10, but based on absorption measurements in short RV bins (3 km/s width). The horizontal line emphasises the stellar effective temperature, Teff = 8052 K (Gray et al. 2006).
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