Fig. 3
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High S/N template spectrum of an early-M dwarf normalized to a PHOENIX atmosphere model. The solid red line is the high S/N template spectrum, while the dashed black line is the PHOENIX model atmosphere. The blue shaded region shows the chromospheric emission. The dotted lines indicate the 1.09 Å FWHM triangular bandpass used to integrate the Ca II H and K lines.
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