Fig. B.1
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Photospheric subtraction procedure for the [O I] 5577, [O I] 6300, and [S II] 6731 lines in the ES 22.5 spectrum of RU Lup. The black lines are the observed spectra. The colored lines superposed on the observed spectra are from the K7 template for the photospheric spectrum of RU Lup, veiled to match the depth of the photospheric lines. Above these spectra are the photospheric-subtracted spectra, shifted vertically by 0.2 for clarity. The shaded areas mark the region where the photospheric spectrum is not completely removed.
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