\definecolor{mycolor1}{rgb}{0.00000,0.44700,0.74100}%
\definecolor{mycolor2}{rgb}{0.85000,0.32500,0.09800}%
\definecolor{mycolor3}{rgb}{0.92900,0.69400,0.12500}%
%
\begin{tikzpicture}
  \footnotesize
  \pgfplotsset{
    plotstyle1/.style={color=mycolor1, forget plot},
    plotstyle2/.style={color=mycolor2, forget plot},
    plotstyle3/.style={color=mycolor3, forget plot}
  }
  \def\rows{1}
  \def\cols{3}
  \def\horzsep{1cm}
  \def\basepath{./figures/}

  \begin{groupplot}[%
      group style={rows = \rows, columns = \cols, horizontal sep = \horzsep},
      scale only axis,
      width=1/\cols*0.7\textwidth -\horzsep,
      legend style={legend columns=2,legend to name=legendname, legend cell align=left,/tikz/every even column/.append style={column sep=0.5cm}}
    ]
    \nextgroupplot[xmin=-6.2,xmax=-3.8,ymin=-0.2,ymax=2.2]
    \input{\basepath mymatlabgroupfigure_11.tikz}
    \coordinate (top) at (rel axis cs:0,1);
    \nextgroupplot[xmin=-3.2,xmax=-0.8,ymin=-0.2,ymax=2.2]
    \input{\basepath mymatlabgroupfigure_12.tikz}
    \nextgroupplot[xmin=-0.2,xmax=2.2,ymin=-0.2,ymax=2.2]
    \input{\basepath mymatlabgroupfigure_13.tikz}
    \coordinate (bot) at (rel axis cs:1,0);
  \end{groupplot}
  \path (top|-current bounding box.south)--coordinate(legendpos)(bot|-current bounding box.south);

\end{tikzpicture}%