Fig. 7.

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Variability of Teff of V509 Cas over the last 70 years, including data from Nieuwenhuijzen & De Jager (2000) (Paper 1) and Nieuwenhuijzen et al. (2012) (Paper 2). The uncertainties for Nieuwenhuijzen et al. (2012) data near the beginning of 2000s are 60–80 K (sample error bar size is shown in the box), while the uncertainties for earlier data are 72 K in 1973, 120 K in 1978, and 240 K in 1984. For Nieuwenhuijzen & De Jager (2000), the uncertainties for all points were not given.
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