begin{figure}[t!]
        centering
        begin{subfigure}{linewidth}
            centering
            fbox{includegraphics[width=0.5linewidth]{J_Fig7}}
            label{1a}
            caption{}
        end{subfigure}\ [1ex]
        centering
        begin{subfigure}{0.5linewidth}
            centering
            fbox{includegraphics[width=0.967linewidth]{J_Fig6}}
            label{1b}
            caption{}
        end{subfigure}%
        begin{subfigure}{0.5linewidth}
            centering
            fbox{includegraphics[width=0.967linewidth]{S3}}
            label{1c}
            caption{}
        end{subfigure}
        caption{ a. blala  b.  blala c. blala }
        label{fig:5}
    end{figure}