\begin{overpic}[width=0.49\textwidth]{HR+55}
\put(1,74){\colorbox{white}{(\sublabel{HR+55}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20120207094717-771-609}{HR+55}}}
%%(\subref{HR+55}) \href{HR+55}
\color{red}
\end{overpic}
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<acquisitions>
</acquisitions>