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Fig. 9.

image

Rotational temperature and mass vs. operational day in IRC+10216. Top panel: sinusoidal fit to the Trotvariation with fixed period of 630 days (solid line). Bottom panel: total gas mass over time. In each panel, the dotted lines indicate the average of each component and the asterisks denote unused data points in the fit (see text). The colour code is the same as in Fig. 6.

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