%% 
%%  The LaTeX Graphics Companion, 2ed (first printing May 2007)
%% 
%%  Example 8-4-14 on page 564.
%% 
%%  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{ttctexa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{348.0pt}
\AtEndDocument{\end{fmffile}}
  \AtBeginDocument{\begin{fmffile}{ftmp}}
\StartShownPreambleCommands
\usepackage{array,multicol,feynmp}
\StopShownPreambleCommands
\begin{document}
    \setlength{\columnseprule}{0pt}
    \begin{multicols}{3}
      \begin{center}
        \begin{fmfgraph*}(30,30)
          \fmfleft{e1,e2} \fmfright{e4,e3}
          \fmf{plain}{v4,v1,v2,v3}
          \fmf{plain,label=$t_{ij}=4$,label.side=left,tension=4}{v3,v4}
          \begin{fmffor}{n}{1}{1}{4}
            \fmf{plain}{v[n],e[n]}
            \fmfv{dec.sh=circle,dec.si=thick}{v[n]}
          \end{fmffor}
        \end{fmfgraph*}\\
        \begin{fmfgraph*}(30,30)
          \fmfleft{e1,e2} \fmfright{e4,e3}
          \fmf{plain}{v4,v1,v2,v3}
          \fmf{plain,label=$t_{ij}=1$,label.side=left}{v3,v4}
          \begin{fmffor}{n}{1}{1}{4}
            \fmf{plain}{v[n],e[n]}
            \fmfv{dec.sh=circle,dec.si=thick}{v[n]}
          \end{fmffor}
        \end{fmfgraph*}\\
        \begin{fmfgraph*}(30,30)
          \fmfleft{e1,e2} \fmfright{e4,e3}
          \fmf{plain}{v4,v1,v2,v3}
          \fmf{plain,label=$t_{ij}=1/4$,label.side=left,tension=1/4}{v3,v4}
          \begin{fmffor}{n}{1}{1}{4}
            \fmf{plain}{v[n],e[n]}
            \fmfv{dec.sh=circle,dec.si=thick}{v[n]}
          \end{fmffor}
        \end{fmfgraph*}
      \end{center}
    \end{multicols}
\end{document}
