Comparison between the G2 FWHM_DRS and the literature v_eq sin i_★ values. Upper panel: correlation between the G2 FWHM_DRS (x-axis) and the literature v_eq sin i_★ values (y-axis), with the Spearman’s correlation coefficient r and p-value shown in the plot. The black line shows the linear fit of the data, and the blue dashed line shows the relation obtained from our selected calibrators (Eq. (7)). Middle panel: residuals of the linear fitting. Lower panel: residuals of the relation from selected calibrators.