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Fig. 1

image

Images of β Pic (left) and the PSF reference star α Pic (right) at an image stretch focusing on the faint outer parts of the PSF. The two frames are as close together in time as possible with only the slew from one target to the next in between. Significant differences between the two PSF representations still persist, however, making it challenging to use α Pic as reference for β Pic.

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