tokens: We thank the anonymous referee for a careful consideration of the manuscript and helpful comments. We thank V.S. Titov for insightful discussions. The calculations presented in this work were performed on the quadri-core bi-Xeon computers of the Cluster of the Division Informatique de l’Observatoire de Paris. K.D. acknowledges funding from the Computational and Information Systems Laboratory and from the High Altitude Observatory, as well as support from the Air Force Office of Scientific Research under award FA9550-15-1-0030. The National Center for Atmospheric Research is sponsored by the National Science Foundation. T.T. was supported by the NSF through grant AGS-1348577 and by NASA's LWS program. B.K. acknowledges support by the DFG.
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