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Table 2

Overview of the instruments involved in the spectroscopic observations during the three last eclipses at epochs E = 8, E = 9, and E = 10.

Observatory Country Telescope type Diameter [m] Spectrograph Res. power Spectral reg. Epoch N

NOT, La Palma Canary Isl. Ritchey-Chrétien 2.56 FIES-Echelle 48 000 3680–7280 Å 10 4
Rozhen Bulgaria Ritchey-Chrétien 2.0 Coude 15 000, 30 000 Hα, Hβ, Na i 8, 9, 10 38
Asiago Italy Cassegrain 1.82 Echelle 20 000 4600–9200 Å 9 5
SPM Mexico Ritchey-Chrétien 2.12 Echelle 18 000 3700–6800 Å 9 1
DDO Canada Cassegrain 1.88 Cassegrain 16 000 Hα, Na i 9 16
Terskol Russia Ritchey-Chrétien 2.0 Echelle 13 500 4200–6700 Å 9 7
Asiago Italy Cassegrain 1.82 AFOSC/echelle 3600 3600–8800 Å 9 3
Piwnice Poland Schmidt-Cassegrain 0.9 CCS 2000–4000 3500–10 500 Å 9, 10 26

Notes. N is the number of spectra.

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