deletions | additions       diff --git a/header.tex b/header.tex  index d36199d..3b83d5b 100644  --- a/header.tex  +++ b/header.tex 
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\newcommand{\vin}{\varv_{\,\mathrm{\infty}}}  \newcommand{\cp}{c_{\mathrm{p}}}  \newcommand{\ttwenty}{6.41$\times10^6$ }  \newcommand{\tsixty}{2.37$\times10^6$ } \newcommand{\mnras}{Monthly Notices Royal Academy of Sciences}