Unit-weight standard deviation of the small-scale calibration as a function of across-scan position on the CCD for an example calibration unit. In this case, AF9, Row 7, Window Class 1, No Gate. This is the same as shown in Evans et al. (2017) for Gaia DR1. The black lines are for the preceding and red for the following FoV calibration units. The magenta lines show the locations of the CCD stitch blocks, and the green dots show the location of detected bad columns (from these calibrations). The cyan lines show the bad columns detected from the low-level CCD calibrations.