Fig. 1
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Telluric blends of the 6521 Å DIB towards HD 166937. The spectrum before telluric correction is displayed as a dashed grey line, whereas the continuous black line shows it afterwards. The water vapour during these observations ranges from 1.92 to 1.99 mm at the zenith. Wavelengths (air) and wave numbers (vacuum) are given in the barycentric rest frame.
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