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Table 1:

Initial optical to radio relationshipsa.
Tracer B1.0 to RadPos GSC2.3 to RadPos DR5 to RadPos
N 1962 2028 300
$\overline{\Delta\alpha \cos\delta}$ -35.2 $\pm$ 4.7 +32.9 $\pm$ 5.5 -4.5 $\pm$ 3.2
$\overline{\Delta\delta}$ +123.5 $\pm$ 4.9 +39.5 $\pm$ 4.7 +13.9 $\pm$ 3.2
A1 +4.7 $\pm$ 6.2 -6.6 $\pm$ 6.7 -3.5 $\pm$ 4.7
A2 +5.9 $\pm$ 5.8 +13.1 $\pm$ 6.3 -19.4 $\pm$ 5.1
A3 +42.1 $\pm$ 5.7 -29.0 $\pm$ 6.1 +6.6 $\pm$ 4.1
A4N +123.0 $\pm$ 5.3 20.9 $\pm$ 5.7 1.6 $\pm$ 4.5
A4S +128.0 $\pm$ 11.9 134.1 $\pm$ 12.5  
a For the catalogs USNO B1.0, GSC2.3, and SDSS DR5 relatively to the collected sample of sources with precise radio interferometric positions (Extended Radio Frame - RadPos, either from ICRF-Ext2, VCS6 or VLAC), are presented: the average offsets in right ascension and declination, the orientation angles (A1-A3) relative to the standard thriedron of equatorial coordinates, and the equatorial biases (A4N and A4S, north and south of -20$^{\circ }$). All values are in milli-arcsec (mas) and the number of sources is given in the first line.

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