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Table 4
Summary of spectroscopic data of Achernar that are contemporaneous to the VLTI observations.
| Date | H line | Instrument | Min. Resolution |
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| 2000 Jan. 11 | Hα + Hβ | ESO/FEROS | 54 000 |
| 2009 Jul. 1 | Hα + Hβ | ECass/OPD | 3400 |
| 2009 Nov. 18 | Hβ | ECass/OPD | 3400 |
| 2011 Jun. 27 | Hα | ECass/OPD | 5400 |
| 2011 Sep. 28 | Hα + Hβ | ECass/OPD | 3400 |
| 2011 Dec. 12 | Hα + Hβ | ESO/HARPS | 109 000 |
| 2012 Aug. 7 | Hα | ECass/OPD | 5400 |
| 2012 Oct. 14 | Hβ | ECass/OPD | 3400 |
| 2012 Nov. 20 | Hα | ECass/OPD | 5400 |
Notes.The typical S/N ratio is 300. The Hα and Hβ spectra are shown in Fig. 3.
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