deletions | additions       diff --git a/header.tex b/header.tex  index 17b570a..36fac18 100644  --- a/header.tex  +++ b/header.tex 
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% see "How to add and manage citations and references in Authorea"   % https://www.authorea.com/users/9932/articles/12628/_show_article  %\bibliographystyle{plainnat} \bibliographystyle{plainnat}  %\newcommand{\msun}{\,\mathrm{M}_\odot}