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Fig. 7


Example of the spectral subtraction procedure. The synthetic inactive template (dotted red line) is overplotted on the observed continuum-normalized spectrum of TWA 9B (solid black line). The differences between observed and template spectra are plotted at the bottom of each box. The hatched areas in the difference spectra represent the excess emissions that have been integrated to obtain the net equivalent widths of the Ca ii IRT lines.

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