reviews, which greatly improved this paper, in particular Sects. 5, 9 and 10. We also thank Rolf Sander and Cornelius Zetzsch for their constructive comments and Louise Phillips for grammatical corrections and rereading. The authors would like to thank the Copernicus production office for language editing and corrections, which greatly improved this article.

Edited by: B. Kravitz

Reviewed by: S. M. Elliott and one anonymous referee

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