Time series for the Ca ii H&K S-index of ι Hor. The solid line represents the cycle calculated by Metcalfe et al. (2010) for the data shown with filled circles. The new data are shown with open plotting symbols. A dashed line follows the new cycle starting after HJD 2 455 500, with the same periodicity. Red filled squares represent the X-ray luminosity of the coronal observations. A dotted line is displayed marking the long-term trend of the cycle maxima.
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