Mean values of the differences in position in the sense O–C to the reference stars as a function of the J − Ks colour index. Bins along the X-axis encompass an interval of 0.05 mag for the WFI (left panels) and 0.2 mag for the SOI (right panels). Each dot represents the mean of at least 12 points for the WFI and 13 points for the SOI. The error bars are standard deviations of the mean and are plotted 1σ above and below the corresponding dot.
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