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Table 4
Journal of observations for 20 CVn and HD 189631.
| Source | Observing period | N | S/N |
|
|
|||
| 20 CVn | |||
| Mathias & Aerts (1996) | 20–21.12.1994 | 8 | 84 |
| Chadid et al. (2001) | 11–15.04.1998 | 113 | 127 |
| 24–25.04.1999 | 31 | 168 | |
| 27–30.04.1999 | 131 | 126 | |
| Erspamer & North (2003) | 05–06.06.1999 | 1 | 308 |
| Unknown | 28–29.03.2002 | 1 | 260 |
| HD 189631 | |||
| Maisonneuve et al. (2011) | 02–09.07.2008 | 274 | 215 |
| 22.06–02.07.2009 | 24 | 165 | |
| 17–21.07.2009 | 25 | 360 | |
Notes. In addition to the original source and the period of observations, we list the number of obtained spectra (N) and the average value of S/N.
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