%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 8-3-7 on page 552.
%% 
%%  Copyright (C) 2007 Michel Goossens, Frank Mittelbach, Denis Roegel, Sebastian Rahtz, Herbert Vo\ss 
%% 
%%  It may be distributed and/or modified under the conditions
%%  of the LaTeX Project Public License, either version 1.3
%%  of this license or (at your option) any later version.
%% 
%%  See http://www.latex-project.org/lppl.txt for details.
%% 

\documentclass{ttctexagray}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{348.0pt}

\StartShownPreambleCommands
\usepackage[]{textopo}
\StopShownPreambleCommands
\begin{document}
\begin{helicalwheel}{1,4[50]}
 \getsequence{PHD}{AQP1.phd}
\end{helicalwheel}
\end{document}