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Stellar proper motions in the Galactic bulge from deep Hubble Space Telescope ACS WFC photometry

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Figure

Fig. 1.— Ratio q ¼ total(ePSF-Btted Cux  Cux from aperture photometry)/
Fig. 2.— Amplitude of the perturbation PSF that must be added to the library ePSF to best represent the scene in each image
Fig. 3.— Scatter in position measurement as a function of object flux, stepping through the photometry passes
Fig. 4.— Example local transformation. The target star is denoted by an as- as-terisk, with the nearest tracer objects denoted by diamonds
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