% One needs PDF2SVG to generate the SVG graph.
% Update Date: 11/17/2014

\documentclass{amsart}
\usepackage[paperwidth=300px, paperheight=100px, top=-10px, left=0px, right=0px, bottom=0px]{geometry}
\usepackage{amsmath,amssymb,nopageno}
\usepackage[all]{xy}
\begin{document}
\Huge
\[
	\xymatrix@C+1em@R+1em{ 
	& A \ar^f[r] \ar^a[d] & B \ar^g[r] \ar^b[d] & C \ar[r] \ar^c[d] & 0 \\
	0 \ar[r] & A' \ar^{f'}[r] & B' \ar^{g'}[r] & C' &
	}
\]
\end{document}