Height variation of the LOS velocity, comparing results from the different methods. On the left we show traditional inferences (from top to bottom): LTE inversions of the Fe I 6173 Å line, bisector velocity of Mg at 50%, bisector velocity of Mg at 30%, and Doppler velocity of the Mg line core. In the center we show NLTE inversion results at different optical depths, selected based on the maximum cross-correlation with the traditional inferences, and on the right scatter plots comparing the results from the different methods. The format is similar to that of Fig. 9.