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Table 2.
Statistics of the least-square fit.
| N | X0 | N′ | Pre-fit χ2 | Post-fit χ2 | |
|---|---|---|---|---|---|
| ICRF1 | 326 | 3.40 | 298 | 0.77 | 0.67 |
| ICRF2 | 1052 | 3.73 | 876 | 1.41 | 1.35 |
| ICRF3 S/X | 1288 | 3.78 | 871 | 1.82 | 1.80 |
| ICRF3 K | 326 | 3.40 | 255 | 1.47 | 1.38 |
| ICRF3 X/Ka | 286 | 3.36 | 168 | 2.17 | 1.31 |
Notes.N stands for the number of common sources between ICRF catalogs and Gaia sample while N′ is the size of clean sample. X0 is computed as 
. The last two columns give the pre- and post-fit reduced-χ2.
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