Lithium equivalent width versus spectral type for FU Tau A (filled star symbol) and other measurements of M-type YSOs collected from the literature (see text in Sect. 3.3). Accretors are characterized by filled symbols. Also plotted are the curves of growth for log g = 4.0 and three different abundances with labels, calculated by Zapatero Osorio et al. (2002).
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