Open Access
Table 2.
Summary of our complete sample in terms of the origin of the data.
| Campaign | Number of | Authors |
|---|---|---|
| sources | ||
| 1998 January | 76 | Barrado y Navascués et al. (2001a) |
| 1999 December | 76 | This work |
| 2001 February | 89 | This work |
| 2001 March | 85 | Anthony-Twarog et al. (2018) |
| 2017 November | 100 | Jeffries et al. (2021) |
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