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\begin{tikzpicture}
%% The displayed WFPC2 image.
\node[anchor=south west] (img) at (0,0)
{\includegraphics[width=0.5\linewidth]
{\bdir/tex/delete-me-wfpc2/wfpc2.pdf}};
%% Its label
\node[anchor=south west] at (0.45\linewidth,0.45\linewidth)
{\textcolor{white}{a}};
%% This histogram.
\begin{axis}[at={(0.52\linewidth,0.1\linewidth)},
no markers,
axis on top,
xmode=normal,
ymode=normal,
yticklabels={},
scale only axis,
xlabel=Pixel value,
width=0.5\linewidth,
height=0.412\linewidth,
enlarge y limits=false,
enlarge x limits=false,
]
\addplot [const plot mark mid, fill=red]
table [x index=0, y index=1]
{\bdir/tex/delete-me-wfpc2/wfpc2-hist.txt}
\closedcycle;
\end{axis}
%% The histogram's label
\node[anchor=south west] at (0.95\linewidth,0.45\linewidth) {b};
\end{tikzpicture}
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