Source-wise positional difference (angular separation) between 190 pairs of the 20 partial combinations (gray dots) made with three catalogs of six as a function of the EESMA in COMB2X. The green curves result from a linear fit between the pair-wise squared COMB2X EESMA and squared positional differences. The red curve is the median fit. The dashed line represents an arc difference equal to the COMB2X EESMA.