\documentclass[12pt]{article}
 \usepackage{inchmargs, headsup}

\setlength{\parskip}{\medskipamount}

% \nofiles % Uncomment this line if there are no cross references.

\input{genmacs}
\input{vtxmacs}

\begin{document}

\setcounter{divisions}{3}

\setlength{\unitlength}{.25in}
 \begin{picture}(20,20)
 \put(0,0){\grid(20,20)}
 \put(0,0){\metal(2,3)}
 \put(4,4){\polyvert(2,4)}
 \put(7,0){\diffvert(2,3)}
 \put(7,5){\diffhor(5,3)}
 \put(15,15){\via}
 \end{picture}

\end{document}
