Fig. 2
Observed spectrum of the M 22 RGB star #III-52 with (red points) and without (blue line and dots) telluric substraction, together with its corresponding synthetic fit (black line). The cleaned and synthetic #III-52 spectra are those already shown in Fig. 1 (lower panel). The left panel is a zoom of the right one around the continuum level where the HF line should be found.
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