Observed Hα profile (black dots) in the selected program stars and the best-fit empirical model from Eq. (2) (bold blue line, 6562.0 to 6562.8 Å). The red and black lines correspond to the best-fit theoretical models computed in 1D LTE and 1D NLTE, respectively. The part of the Hα line used in the fit is the same for all stars in the sample. The thin blue line is only shown to help guide the eye; the red wing of Hα was not used in the fit. Line bisectors are indicated in the inset. The spectra are arranged in order of increasing metallicity.
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