Fig. 2
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CRIRES+ observation of the telluric standard star α Aql from 17 August 2021 (airmass = 1.47, IWV = 3.22 mm) for two different chunks (left and center panels) and a zoom-in (right panel). Top panels: observed spectrum (red) without the gas cell, and the best-fit telluric model (blue) from viper. Bottom panels: residuals and their standard deviations.
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