Estimating activity cycles with probabilistic methods - II. The Mount Wilson Ca H&K data N. Olspert, J. J. Lehtinen, M. J. Käpylä, J. Pelt and A. Grigorievskiy A&A, 619 (2018) A6 Published online: 30 October 2018 DOI: 10.1051/0004-6361/201732525