\begin{overpic}[width=0.49\textwidth]{K3}
\put(1,74){\colorbox{white}{(\sublabel{K3}) \href{http://dream.misasa.okayama-u.ac.jp/?q=20190221092209-447288}{K3}}}
%%(\subref{K3}) \href{K3}
\color{red}
\put(50.0,37.5){\footnotesize \circle{0.7} \href{http://dream.misasa.okayama-u.ac.jp/?q=20190221095943-305763}{spot of ys_mer_OK10VMa@30}} % 20190221095943-305763 % \vs(2779.0, -4505.0)
\put(53.9,46.2){\footnotesize \circle{0.7} \href{http://dream.misasa.okayama-u.ac.jp/?q=20190221095922-931106}{spot of ys_mer_OK10Vma@29}} % 20190221095922-931106 % \vs(2806.1, -4447.5)
%%scale 100 micro meter
\put(1,1){\line(1,0){15.0}}
\end{overpic}