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Table 2
Journal of archival spectroscopic observations of ζ Ori A obtained with HEROS, FEROS and UVES.
| Date | JD | Instrument | T exp | S / N | φ orb |
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| 1995 | 2 449 776.024 | HEROS | 57 × 1200 | 1200 | 0.90 |
| 1997 | 2 450 454.379 | HEROS | 16 × 1200 | 1000 | 0.15 |
| 1999 | 2 451 147.333 | HEROS | 64 × 1200 | 1200 | 0.41 |
| 2006 | 2 453 738.159 | FEROS | 60 | 100 | 0.37 |
| 2007 | 2 454 501.018 | FEROS | 2 × 20 | 250 | 0.66 |
| 2009 | 2 454 953.970 | FEROS | 5 × 10 | 200 | 0.84 |
| 2010 | 2 455 435.373 | UVES | 36 × 2 | 2000 | 0.01 |
Notes. Columns: date and heliocentric Julian date, instrument used, exposure time, signal-to-noise ratio, and orbital phase.
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