Ordered standard deviations of the multiple [Fe/H] values under various data handling as given by the code list in the upper left part of the figure. First number in the code symbol corresponds to the log g correction term (C_g in Eq. (1)), whereas the second number indicates if source-by-source zero point correction was (1) or was not (0) employed. The inserted panels show the scatter of the star-by-star individual metallicity values {feh} around the corresponding average metallicities FEH. The equality lines are indicated by light blue. The standard deviations are shown by the internal labels.