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Table 1
Log of VLT/UVES observations.
| QSO | Observing dates | Setting | Exposure time | Seeing (′′) | Airmass |
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| SDSS J214043.02−032139.2 | 15-06-2013/02-07-2013 | 390+580 | 4 × 3900 s | 0.7−0.8 | 1.1 |
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| SDSS J145646.48+160939.3 | 06-05-2013/12-05-2013 | 390+760 | 3 × 3900 s | 0.9 | 1.3−1.4 |
| 07-06-2013 | 390+580 | 1 × 3900 s | 1.0 | 1.3 | |
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| SDSS J015445.22+193515.8 | 01-09-2013/04-09-2013/05-09-2013 | 390+580 | 4 × 3900 s | 0.8−1.0 | 1.4 |
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