%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example D-11-8 on page .
%% 
%%  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{ttctexaplate}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{413.44133pt}

\StartShownPreambleCommands
\usepackage{xcolor,multido}
\definecolorseries{testB}{rgb}{grad}[rgb]{1,1,0}{-1,-1,0}
\definecolorseries{testC}{rgb}{grad}[rgb]{1,1,0}{-1,0,1}
\resetcolorseries[90]{testB} \resetcolorseries[180]{testC}
\linethickness{0.005\linewidth}
\StopShownPreambleCommands
\begin{document}
\noindent
\multido{\nC=1+1}{180}{\color{testB!!+}%
  \line(0,1){50}\hspace{0.0025\linewidth}}
\qquad
\multido{\nC=1+1}{180}{\color{testC!!+++}%
  \line(0,1){50}\hspace{0.0025\linewidth}}
\end{document}