Small-scale distortion for ungated observations on one of the astrometric CCDs (strip 7, row 4). The curves show the median AL residual for sources in the magnitude range G = 13–16 plotted against the AC pixel coordinate μ, and subdivided according to field of view (preceding PFoV, or following FFoV) and time (before or after the decontamination at OBMT ≃ 2400). For better visibility, the successive curves were vertically displaced by 0.1 mas. The vertical dashed lines show the stitch block boundaries, which divide the 1966 pixels in blocks of 250 pixels, except for the two outermost blocks that are 108 pixels.
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