Detail of the spectrum of FU Tau A (black solid lines) in the wavelength range around the K i (upper panel) and Na i (lower panel) absorption doublets. The spectrum of FU Tau A has been corrected for telluric absorption lines. The blue and the red dotted lines and the green dashed line represent synthetic spectra with log g as labeled for Teff = 2900 K and rotationally broadened to vsini = 20 km s-1.
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