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Fig. 4


Applied distortion parameters for the basic distortion correction over frame number for the NGC 6388 (left) and 47 Tuc data (right). The panels show from top to bottom the calculated distortion parameters for x scale, y scale, and rotation for each frame. While the rotation parameter is random, the scale parameter of the NGC 6388 data shows a pattern that is not visible in the 47 Tuc data. The vertical lines indicate after which frame the jitter movement of five positions (five or ten frames) was repeated and highlight the introduced pattern.

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