Fig. A.1
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Spectral comparison to PHOENIX photospheric models for Paβ. Shown are the normalized spectra of the M0.5 V star J02222+478/BD+47 612 and the M5.0V star J18165+048/G 140-051 from Fig. 1 as black solid line with an offset indicated by the grey dashed line. In red PHOENIX photospheric comparison spectra are shown. The vertical dashed line marks the position of the Paβ line.
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