Fig. 2.
Biases of Volumes 16 and 17 of Yale Zone Catalogs with respect to Gaia-DR2 at J1933.50, after having applied the conversion from the FK4 system to the ICRS. Top panels: local biases for positions along the directions of Right Ascension (left) and Declination (right), and bottom panels: biases for proper motions. The absolute value of the color-bar limits for the top panels is the 99th percentile of 
, and, for the bottom panels, the 99th percentile of 
.
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