Fig. A.1
Example of telluric features removal for the SARG spectrum in the region of Na i D1. Upper panel: observed data (black line) and best fit LBLRTM model (blue line). Lower panel: telluric-corrected spectrum. The dashed vertical line marks the position of Na i D1 (vhel ~ 180 km s-1). The S/N ratio on the continuum is about 100 (the error-bars indicate the estimated rms noise).
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