Fig. 6.
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Calibration of the relative PMs to an absolute scale using Gaia DR3 stars as reference objects. The two panels show the differences between the relative HST PMs and absolute PMs from well-measured Gaia stars for NGC 1850. The PM ZP in each direction is determined as the 2.5σ-clipped median value (orange solid line in each panel). Excluded stars are marked with grey symbols.
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