Hα profile fits of five dwarf stars from Meléndez et al. (2010). In the left panels the observational spectra are shown in black. The fitted 3D NLTE synthetic Hα line profile is represented by the red continuous line, and a synthetic profile related to a T_eff −200 K is represented by the dashed red line. Shades represent the windows of fits employed. The right panels show histograms of the temperature values related every pixel within the windows of the fits. The histograms are fitted by Gaussian distributions (black lines), whose medians and 1σ dispersions, are the most likely T_eff values and their corresponding errors.