Fig. 22

image

Effects of AC and AL rate variations on the observed PSF. The two panels on the left depict many stacked observations from FOV1 ROW1 AF6 gate 0, for two narrow ranges of AC rate at high negative (− 1.0 →−0.95 pix s−1 ; left) and high positive (0.95 → 1.0 pix s−1 ; middle) values. These reveal an apparent shear between the two PSFs that is clear in a plot of the difference (right panel). Thiseffect is induced by non-zero AL rate, as explained in the text.

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