VLBA-Gaia parallax (left panel) and proper motion (μ_α^* in the center, and μ_δ to the right) comparisons. Top panels: scatter plots of measured values. Red symbols indicate sources related to multiple systems, and black symbols are likely single sources. The dashed line is the equality line, which is included for eye guidance. The determined correlation coefficient (r) and its statistical significance are included in each case. Lower panels: histograms showing the differences between VLBI and Gaia EDR3 astrometric parameters for matched likely single sources.