Photometric accuracy of the sample of 402 clusters (all dots) selected with available photometry in all filters from the Johnson et al. (2012) catalog. Group 1 clusters (65 objects, large filled dots) have upper limit of the accuracy indicated by long dashed lines in different filters. Group 2 clusters (138 objects, large open dots) have accuracy <0.5 mag (short dashed lines) in all filters. Small gray dots designate clusters which are not members of group 1 or group 2 and not studied in the following because of too low photometric accuracy (they have accuracy >0.5 mag in at least one filter). In each panel we indicate the number of clusters (from the total 203 clusters of group 1 and group 2) with photometric accuracy better than 0.1, 0.05 and 0.03 mag in the filter associated with the panel.
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