Top: a series of 21 consecutive 32 × 32 pixel subrasters of λ Ori obtained by UBr in the Orion I field. There is one blurred image in the series (6), while some are partly shifted beyond the subraster (5, 6, 11, 12). Bottom: the variations of the position of the stellar centroids in x (left) and y (right) coordinate for the whole run of UBr. The positions of stellar images in the presented subrasters are shown with open circles.
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