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Fig. 3
Normalised and rectified spectra of the Na i D doublet in the UVES spectra; each spectrum is offset from the one below by unity. The vertical dotted lines mark telluric emission at the rest wavelengths. Overplotted in green are the combined fits of ensembles of Gaussians to the D1 line centred between 5900.3–5902.2 Å.
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