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Fig. 1

image

Left: dependence of S on Teff, log g. Right: best fit of synthetic spectrum 2900/5.0/0 to the observed VLT/X-shooter spectrum of Proxima. We remove here the spectral regions of the strong telluric absorption in J and K bands; spectral ranges used for the fits are indicated by horizontal lines at Fλ = 0.8.

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