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Fig. 2

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Spectra of DQ Tau taken with the visual arm of X-shooter and with UVES. The wavelength ranges in black (590–600, 600–610, 610–620, 640–650, and 658–667 nm) correspond to the five regions where the BF was calculated for each epoch. The wavelength ranges were chosen to be free of strong emission lines and telluric contamination.

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