Ratio of standard deviations, Rσ (blue dots) defined as explained in the text, for UBr observations of 16 stars in the Scorpius I field (setups 1, 2, and 4), nine stars in the Cygnus II (setup 4) field, 14 stars in the Crux/Carina I field (setup 4), and five stars in the Cygnus/Lyra I field (setup 2). The number at the top of each panel is the number of days elapsed since the launch of UBr, for the mid-time of a given setup. The horizontal red dashed lines denote the mean values of Rσ for the last four test setups.
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