Median standard deviation for all solutions covering the OBMT-Rev range [3000, 4000], normalised to the median standard deviation of all calibrations obtained for the same photometer (BP/RP), gate, and window class at iteration 50 (by that iteration the system seems to have become quite stable). Top panels: BP solutions, one panel per nominal combination of gate and window class. Bottom panels: RP solutions. Different colours indicate different CCD rows and solid and dashed lines are used for the preceding and following FoV, respectively.