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Table 1.
Photometry of Q0957+561.
| Object | g-SDSS | r-SDSS | (g − r) |
|---|---|---|---|
| Star D | 15.481 ± 0.002 (15.486) | 14.946 ± 0.003 (14.951) | 0.535 ± 0.004 |
| Star E | 15.858 ± 0.003 (15.816) | 15.240 ± 0.002 (15.217) | 0.599 ± 0.005 |
| QSO A | 17.825 ± 0.004 | 17.504 ± 0.004 | 0.321 ± 0.006 |
| QSO B | 17.159 ± 0.002 | 16.895 ± 0.003 | 0.264 ± 0.004 |
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