tokens: We thank the referee for a timely and constructive report that helped improve this paper. We would like to thank David Phillips and the members of the HARPS-N solar telescope team for sharing the data with us before their publication. The research leading to these results received funding from the European Union Seventh Framework Programme (FP7/2007-2013) under grant agreement number 313014 (ETAEARTH). A.C.C. acknowledges support from STFC grant ST/M001296/1.
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