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Table 1

TIGRE observational data.

Season First date Last date No. of SMWO S/N

2013/14 2013-12-18 2014-08-14 77 65
2014/15 2014-12-24 2015-06-11 73 78
2015/16 2016-01-08 2016-05-09 88 76

Notes. Observational season, start, and end (YY-MM-DD) of time series, number of used S-indices, and the mean S/N in the Ca ii H and K region (3880–4020 Å)

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