Open Access
Table A.1
HELIOS observations used in this work.
| Observation date | Start time (UTC) | End Time (UTC) | Exp. numbers | Airmass range | S/N |
|---|---|---|---|---|---|
| January 20, 2023 | 17:31 | 19:26 | 113 | 1.03 - 1.23 | 664 |
| January 21, 2023 | 12:00 | 15:34 | 155 | 1.07 - 2.48 | 662 |
| January 23, 2023 | 12:00 | 17:47 | 99 | 1.02 - 2.52 | 656 |
| January 24, 2023 | 14:21 | 18:41 | 202 | 1.02 - 1.24 | 665 |
| January 26, 2023 | 13:20 | 21:12 | 462 | 1.02 - 1.95 | 660 |
| January 27, 2023 | 12:19 | 16:22 | 239 | 1.03 - 2.21 | 655 |
| February 01, 2023 | 18:37 | 20:35 | 117 | 1.12 - 1.61 | 654 |
| February 02, 2023 | 14:42 | 18:45 | 239 | 1.02 - 1.19 | 657 |
| February 03, 2023 | 14:10 | 18:10 | 236 | 1.03 - 1.31 | 654 |
| February 06, 2023 | 14:58 | 18:48 | 226 | 1.03 - 1.16 | 653 |
| February 15, 2023 | 14:15 | 22:45 | 500 | 1.04 - 6.81 | 648 |
| February 16, 2023 | 14:08 | 21:07 | 331 | 1.05 - 2.03 | 648 |
Notes. All observations were obtained with an exposure time of 50.1597 s. We note the important air mass range for numerous days that is taken into account during data reduction (see Sect. 3.1.3). In the last column, we report the average S/N around the He triplet feature.
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