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Fig. A.1.


Centre-to-limb variation of facular flux difference. Here r/R is the normalised radial distance from the centre of the stellar disc. Two flux differences for metallicities are shown: the solar value M/H = 0.0 and M/H = 0.3: panel a: flux differences in the Strömgren b filter and panel b: in the Kepler pass-band.

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