begin{figure}[!htpb]
    centering
    subfloat[]{includegraphics[width=5.3cm] {fig1}} \
    vspace{-10pt}
    subfloat[]{includegraphics[width=5.3cm] {fig2}} \
    vspace{-10pt}
    subfloat[]{includegraphics[width=5.3cm] {fig3}} \
end{figure}

begin{figure}[!htpb]
    centering
    begin{minipage}{columnwidth}
        subfloat[]{includegraphics[width=5.3cm] {fig1}}   \
        vspace{-10pt}
        subfloat[]{includegraphics[width=5.3cm] {fig2}}    \
        vspace{-10pt}
        subfloat[]{includegraphics[width=5.3cm] {fig3}} \
    end{minipage}
end{figure}