Calibration curves showing Stokes V width and MLR values as functions of the intrinsic field B for different turbulent velocities, which determine W_I. The turbulent velocities vary from 0 (blue lines) to 20 km s⁻¹ (red lines). Panelsa–c, d–f and g–i correspond to 5247/5250, 6301/6302 and 15652/15649 pairs, respectively. The left column (panels a, d and g) show Stokes V widths for lines with lower Lande factors g, the middle column (panels b, e and h) show Stokes V widths for lines with higher Lande factors g, and the right column (panels c, f and i) shows MLR values.