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Fig. 3

image

Distribution of the parallax and proper motion errors on a Hammer-Aitoff equatorial projection of the sky. All maps are for case A (full five-parameter solutions for all stars). Left figures: results from the 12 months’ Gaia-only simulation. Some regions of the sky are poorly observed resulting in zonal errors. Right figures: HTPM results for the same stars. The prior helps to disentangle proper motion and parallax, therefore we find a more homogeneous distribution of errors at an overall lower level. The cyan line follows the ecliptic for reference.

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