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Table 2
Log of the optical images acquired with TNG+DOLoReS and used to perform the astrometric calibration of the field of selected sources belonging to our sample (see also Fig. 2).
| Object | Date and time (UT) | Texp (s) | Filter | Seeing |
|
|
||||
| IGR J17476−2253 | 21 Jun. 2012, 03:15 | 300 | R | 0 9 |
| IGR J17488−2338 | 01 Sep. 2010, 20:55 | 5 | open | 12 |
| IGR J18256−1035 | 21 Aug. 2011, 22:46 | 5 | open | 09 |
| IGR J19295−0919 | 22 Aug. 2011, 00:00 | 10 | open | 10 |
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