Fig. 3
Telluric sodium correction for WASP-69 spectra. The red spectrum is one of WASP-69 observed spectra for night 1, where the telluric sodium features can be observed in the wings of the stellar Na I lines. The blue line is the corresponding sky spectrum taken with the HARPS-N fiber B, and the black line is the resulting WASP-69 spectrum after the sky subtraction.
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