\input{../preamble.tex}
\input{../beamer_preamble.tex}

% This switches fonts to the Palatino family.
%  \renewcommand{\familydefault}{ppl}

\usepackage{array}

\renewcommand{\pathtodiagrams}{../diagrams/}

\renewcommand{\bigraph}[1]{{\hspace{-3pt}\begin{array}{c}%
  \raisebox{-2.5pt}{\includegraphics[height=4.5mm]{\pathtodiagrams bigraphs/#1}}%
\end{array}\hspace{-3pt}}}