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Published online by Cambridge University Press: 25 May 2016
The concept of starspots or maculation is well established. There is indeed such a variety of corroborative evidence for those stars associated with ‘activity’ effects that we cannot imagine photospheric maculation not being a factor. The subject was reviewed by Eaton (1992), and a comprehensive background recently provided by Eker (1995), while relevant papers continue to be presented at more or less annual cool stars symposia. Even so, confidently testifying to more than the mere existence of starspots is non-trivial.