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\graphicspath{{./figs/}}

\begin{document}
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  \centering
  \begin{picture}(150,60)
    \put(0,0){
      \includegraphics*[width=75mm,height=60mm,%
      ]{Fig11a.pdf}
    }
    \put(75,0){
      \includegraphics*[width=75mm,height=60mm,%
      ]{Fig11b.pdf}
    }
    \put( 35,1)   { $p^{\mathrm{T}}_{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace}$}
    \put(110,1)   { $p^{\mathrm{T}}_{\mathrm{C}}$}
    \put( 58,1)   { $\left[ \mathrm{GeV}/c\right]$}
    \put(133,1)   { $\left[ \mathrm{GeV}/c\right]$}
    \put(-2 , 28 )  { \small %
      \begin{sideways}%
        $\tfrac{\mathrm{d}\ln\sigma}{{\mathrm{d}}p^{\mathrm{T}}_{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace}}%
        ~\left[ \tfrac{1}{500~\mathrm{MeV}/c}\right]$
      \end{sideways}%
    }
    \put(73,  28 )  { \small %
      \begin{sideways}%
        $\tfrac{\mathrm{d}\ln\sigma}{{\mathrm{d}}p^{\mathrm{T}}_{\mathrm{C}}}%
        ~\left[ \tfrac{1}{500~\mathrm{MeV}/c}\right]$
      \end{sideways}%
    }
    \put( 55,45){ \small %
      LHCb 
    }
    \put(130,45){ \small %
      LHCb
    }
    \put( 65,52)   { a) }
    \put(140,52)   { b) }
    \put(12,20){  \tiny
      $\begin{array}{clcl}
        {\color{red}      \text{\ding{108}} } & \ensuremath{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace{}\ensuremath{D}\xspace^0}\xspace & { \text{\ding{109}} } & \ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace \\ 
        {\color{blue}     \text{\ding{110}} } & \ensuremath{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace{}\ensuremath{D}\xspace^+}\xspace & &  \\
        {\color{RootSix}  \text{\ding{115}} } & \ensuremath{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace{}\ensuremath{D}\xspace^+_{\mathrm{s}}}\xspace & &  \\
        {\color{RootSeven}\text{\ding{116}} } & \ensuremath{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace{}\Lambda^+_{\mathrm{c}}}\xspace & &  \\
       \end{array}$
    } 
    \put(87,20){ \tiny
      $\begin{array}{clcl}
        {\color{red}     \text{\ding{108}} } & \ensuremath{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace{}\ensuremath{D}\xspace^0}\xspace & {\color{red}    \bigcirc}  & \ensuremath{\ensuremath{\ensuremath{D}\xspace}\xspace^0}\xspace \\
        {\color{blue}    \text{\ding{110}} } & \ensuremath{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace{}\ensuremath{D}\xspace^+}\xspace & {\color{blue}   \square}   & \ensuremath{\ensuremath{\ensuremath{D}\xspace}\xspace^+}\xspace \\
        {\color{RootSix} \text{\ding{115}} } & \ensuremath{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace{}\ensuremath{D}\xspace^+_{\mathrm{s}}}\xspace & {\color{RootSix}\triangle} & \ensuremath{\ensuremath{\ensuremath{D}\xspace}\xspace^+_\ensuremath{\ensuremath{s}\xspace}\xspace}\xspace \\
        {\color{RootSeven}    \text{\ding{116}} } & \ensuremath{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace{}\Lambda^+_{\mathrm{c}}}\xspace & &  
       \end{array}$
    } 
  \end{picture}
\end{document}
