tokens: We thank Kevin Schlaufman, Saul Rappaport, Jens Jessen-Hansen, and the anonymous referee for helpful comments and suggestions that have significantly improved this manuscript. Part of this manuscript was written at MIT and V.V.E. appreciates the hospitality of the researchers and staff at the MIT Kavli Institute for Astrophysics and Space Research. Work by J..N.W. was partly supported by funding from the NASA Origins program (grant ID NNX11AG85G). Funding for the Stellar Astrophysics Centre is provided by The Danish National Research Foundation (grant agreement No. DNRF106). The research is supported by the ASTERISK project (ASTERoseismic Investigations with SONG and Kepler ) funded by the European Research Council (grant agreement No. 267864). We acknowledge ASK for covering travels in relation to this publication. Part of this work was supported by the Danish Council for Independent Research, through a DFF Sapere Aude Starting grant No. 4181-00487B.
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