My question is already written on the title above.
EDIT 1:
I attempted to use \Centering and remove \arraybackslash in my original code below. It cannot be compiled.
\documentclass[dvips,dvipsnames,rgb]{book} \usepackage[a4paper,margin=10mm,showframe]{geometry} \usepackage{longtable} \usepackage{array} \usepackage{calc} \usepackage{ragged2e} \usepackage{lscape} \newcounter{No} \renewcommand{\theNo}{\stepcounter{No}\arabic{No}} \newenvironment{MyTable}[4]% {% \newcolumntype{A}[1]% {% >{% \begin{minipage}% {% ##1\linewidth-2\tabcolsep-2\arrayrulewidth% }% \vspace{\tabcolsep}% }% c% <{\vspace{\tabcolsep}\end{minipage}}% }% \setcounter{No}{0}%comment out this if you want to continuous numbering for all tables. \begin{longtable}% {% |>{\scriptsize\Centering\theNo}A{#1}<{}% |>{}A{#2}<{\Centering\input{\jobname.tmp}}% |>{\Centering\lstinputlisting{\jobname.tmp}}A{#3}<{}% |>{\scriptsize\arraybackslash}A{#4}<{}%Please try to remove \arraybackslash here. |% }% \hline\ignorespaces% }% {% \end{longtable}% } \newcommand{\Comment}[1]{& & & #1\\\hline} \usepackage{listings} \lstset{% language={PSTricks}, basicstyle=\ttfamily\scriptsize,% keywordstyle=\color{blue}%, %backgroundcolor=\color{yellow!30}% } \usepackage{fancyvrb} \def\MyRow{% \VerbatimEnvironment% \begin{VerbatimOut}{\jobname.tmp}% } \def\endMyRow{% \end{VerbatimOut}% } \usepackage{pstricks,pst-node} \newpsstyle{gridstyle}{% gridwidth=0.4pt,%default: 0.8pt gridcolor=Red!20,%default: black griddots=0,%default: 0 % gridlabels=3pt,%default: 10pt gridlabelcolor=Blue,%default: black % subgriddiv=5,%default: 5 subgridwidth=0.2pt,%default: 0.4pt subgridcolor=Green!20,%default: gray subgriddots=0%default: 0 } \usepackage{lipsum} \begin{document} \chapter{Introduction to PSTricks} \lipsum[1] \section{At a glance galleries} \lipsum[1-5] %Landscape starts here. \pagestyle{empty} %\begin{landscape} \begin{MyTable}{0.05}{.25}{0.4}{0.3}% %============= \begin{MyRow} \pspicture*[showgrid](4,4) \pnode(1,1){A} \pnode(3,3){B} \ncline{A}{B} \endpspicture \end{MyRow} \Comment{\lipsum[1]} %============= \begin{MyRow} \begin{pspicture}[showgrid](4,3) \psframe*[linecolor=red!30](3,2) \end{pspicture} \end{MyRow} \Comment{\lipsum[2]} %============= \begin{MyRow} \pspicture[showgrid](4,3) \psframe*[linecolor=green!30](3,2) \endpspicture \end{MyRow} \Comment{\lipsum[3]} %============= \begin{MyRow} \pspicture[showgrid](4,3) \psframe*[linecolor=yellow!30](3,2) \endpspicture \end{MyRow} \Comment{\lipsum[4]} %============= \begin{MyRow} \pspicture[showgrid](4,3) \psframe*[linecolor=Maroon!30](3,2) \endpspicture \end{MyRow} \Comment{\lipsum[5]} %============= \end{MyTable} %Landscape stops here. %\end{landscape} \pagestyle{plain} \section{Node} \lipsum[1-5] \end{document} 
