deletions | additions       diff --git a/header.tex b/header.tex  index ff5bd8d..4b6dcbf 100644  --- a/header.tex  +++ b/header.tex 
...
\newcommand{\catme}{\href{http://www.catme.org}{CATME}}  \newcommand{\ipython}{iPython}  \newcommand{\np}{numpy}  \newcommand{\sp}{scipy}  \newcommand{\plt}{matplotlib}