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0x0001A ICRF-Ext2 (Fey et al., Cat. J/AJ/127/3587, ICRF-EXT.2)
0x0002B VLBA (Beasley et al., Cat. J/ApJS/141/13, VCS1, Fomalont et al., Cat. J/AJ/126/2562, VCS2)
0x0004C VLA-015, VLA catalog minus 15 sources, (Cat. J/ApJS/141/13, J/AJ/126/2562, J/AJ/129/1163, J/AJ/131/1872)
0x0008D JVAS (Patnaik et al., Cat. VIII/60)
0x0010E SDSS (Adelman-McCarthy et al., Cat. II/282)
0x0020F 2QZ (Croom et al., Cat. VII/241)
0x0040G FIRST (Becker et al., Cat. VIII/71)
0x0080H VLA+015, VLA catalog (Cat. J/ApJS/141/13, J/AJ/126/2562, J/AJ/129/1163, J/AJ/131/1872)
0x0100I HB (Hewitt & Burbidge, Cat. VII/158)
0x0200J 2MASS (Cutri et al., 2003, Cat. II/246)
0x0400K GSC2.3 (Lasker et al., Cat. I/305)
0x0800L USNO B1.0 (Monet et al., Cat. I/284)
0x1000M VV06 (Veron et al., 2006, Cat. VII/248)