Microturbulence as function of EW and REW for the Ba resonance line at λ4934 Å. Microturbulence values determined from diverse methods are represented according to the legends. The solid black line is the polynomial regression of $v_{mic}^{Ba4934}$ (Eq. (2)). The dashed line is the LOWESS regression. Microturbulence values corresponding to discrete points of the curve, separated by 20 mÅ, from 260 to 160 mÅ are noted.