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Table 1
Observational information.
| Star | Sp.T.1 | Instrument | Resolving power | Date of observation |
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| BD +60261 | O7.5 III(n)(f) | FIES | 25 000 | 19 Sep. 2011 |
| HD 24912 | O7.5 III(n)(f) | FIES | 46 000 | 09 Sep. 2008 |
| HD 34656 | O7.5 II(f) | FIES | 46 000 | 24 Dec. 2012 |
| HD 35633 | O7.5 II(n)(f)2 | FIES | 25 000 | 29 Jan. 2013 |
| HD 36861 | O8 III((f)) | HERMES | 85 000 | 03 Feb. 2014 |
| HD 94963 | O7 II(f) | FEROS | 48 000 | average 21 and 27 Apr. 2007 |
| HD 97434 | O7.5III(n)((f)) | FEROS | 48 000 | average 26 May 2007/22 Mar. 2011/02 Apr. 2015 |
| HD 151515 | O7 II(f) | FEROS | 48 000 | 19 Apr. 2007 |
| HD 162978 | O8 II((f)) | FIES | 46 000 | 28 Aug. 2011 |
| HD 163800 | O7.5 III((f)) | FIES | 46 000 | 10 Sep. 2011 |
| HD 167659 | O7 II-III(f) | FIES | 46 000 | 08 Sep. 2010 |
| HD 171589 | O7 II(f) | FIES | 25 000 | 12 Sep. 2011 |
| HD 175754 | O8II(n)((f))p | FIES | 46 000 | 08 Sep. 2010 |
| HD 186980 | O7.5 III(f) | FIES | 46 000 | 08 Aug. 2010 |
| HD 203064 | O7.5 IIIn((f)) | HERMES | 85 000 | 16 Jun. 2011 |
Notes.
(1)
Spectral types are from Sota et al. (2011, 2014).
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