%%
%% The LaTeX Companion, 3ed
%%
%% Example 5-1-1 on page I-367 in "Geometrical dimensions of the layout".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{207.0pt}

\usepackage[landscape,a5paper,hmarginratio=1:4]{geometry}
\usepackage{layout,color}

\makeatletter             % put some color into the picture
\def\Identify#1{%
  \put(\PositionX,\PositionY){\circle{20}}
  \put(\PositionX,\PositionY){\makebox(0,0){\color{blue}\tiny\bfseries #1}}
}
\makeatother


%StartShownPreambleCommands

%StopShownPreambleCommands

\begin{document}
\makeatletter\@twosidefalse\makeatother %pretend we do not have
                                        %twoside set
\layout
\end{document}