\begin{overpic}[width=0.49\textwidth]{chd4}
\put(1,74){\colorbox{white}{(\sublabel{chd4}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20171011113523-213716}{chd4}}}
%%(\subref{chd4}) \href{chd4}
\color{red}
%%scale 100 micro meter
\put(1,1){\line(1,0){6.0}}
\end{overpic}
<?xml version="1.0" encoding="UTF-8"?>
<acquisitions>
</acquisitions>