Influence of telluric lines on the spectrum of HD 189733 obtained with HARPS on the red part of the CCD (5380 to 6900 Å) for the night of 19 July 2007. The upper panel a–e is the observed stellar spectrum with telluric contamination. Panel a′–e′ is the best fit telluric model obtained with Molecfit with H2O in blue and O2 in red. Panels b, b′; c, c′; d, d′; and e, e′ are close-up views of the green zones in panel a, a′. These contain the strongest telluric bands in the visible (from left to right: H2O (203-000, 302-000, 321-000) band at ~5900 Å around the Na doublet, O2γ band at ~6200 Å, H2O (311-000) band at ~6500 Å and O2 B band at ~6900 Å).
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