\documentclass{article}

% ---------------------------------------------------------------------
%  PACKAGES
% ---------------------------------------------------------------------
\usepackage[margin=0in,paperwidth=7in,paperheight=7in]{geometry}
\usepackage{amsthm,amsfonts,amsopn,amsmath,natbib}
\usepackage{pgf,pgfplots,tikz,pgfkeys}
\usepackage{versions}

%Choose whether to typeset figures in color or black and white.
\excludeversion{grayfig}
\includeversion{colorfig}


 \usetikzlibrary{arrows,calc,fit,matrix,positioning,shapes.multipart,shapes.symbols}



\begin{document}
\input{ac2aPencilConstants}
\thispagestyle{empty}

\begin{center}
\begin{tikzpicture}[scale=1.4]
\input{ac2apencilColor}
\end{tikzpicture}
\end{center}
\end{document}
