\begin{figure}[!h]
  \centering

  \scalebox{0.70}{
    \input{figures/sin_2jet_5.tex}
  }

  \vspace{-0.6ex}
  \noindent\rule{\textwidth}{1pt}
  \vspace{-0.6ex}

  \scalebox{0.70}{
    \input{figures/sin_2jet_6.tex}
  }

  \vspace{-0.6ex}
  \noindent\rule{\textwidth}{1pt}
  \vspace{-0.6ex}

  \scalebox{0.70}{
    \input{figures/sin_2jet_7.tex}
  }


  \vspace{-0.6ex}
  \noindent\rule{\textwidth}{1pt}
  \vspace{-0.6ex}

  \scalebox{0.70}{
    \input{figures/sin_2jet_8.tex}
  }

  \caption{\textbf{Step-by-step illustration of propagating \texttt{sum} nodes up a computation graph.}}
  \label{fig:pull-sum-simplification}
\end{figure}
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