author: Dmitri Fedorov source:

\begin{fmffile}{ee}
\begin{fmfgraph*}(40,25)
\fmfleft{o1,o2}
\fmfright{i1,i2}
\fmflabel{$\psi(x)$}{i1}
\fmflabel{$\bar\psi(x)$}{o1}
\fmflabel{$\psi(x')$}{i2}
\fmflabel{$\bar\psi(x')$}{o2}
\fmf{fermion}{i1,v1,o1}
\fmf{fermion}{i2,v2,o2}
\fmf{photon,label=$\underline{A_\mu(x)A_\nu(x')}$}{v1,v2}
\fmflabel{$ie\gamma^\mu$}{v1}
\fmflabel{$ie\gamma^\nu$}{v2}
\end{fmfgraph*}
\end{fmffile}

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