Fig. A.1

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Comparison of the profiles of the model (solid line) and measured image of the same star (dots) along the X (plot a) and Y (plot b) axes. The profiles are normalized to the maximum value of 1. The profile of the star depends on the center position of the star within one pixel. On the X-axis, the center of the star image coincides with the middle of the pixel, whereas it is slightly shifted on the Y-axis.
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