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\usepackage{graphicx}
\usepackage{xspace}
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\begin{document}
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  \centering
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    \put( 1,0){\includegraphics*[width=80mm,height=60mm%
      ]{figs/Fig3a.pdf}
    }
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      ]{figs/Fig3b.pdf}
    }
    \put(14,47){(a)}
    \put(94,47){(b)}
    \put(-1,13){\begin{sideways}\small{ Candidates/(5\ensuremath{{\mathrm{\,Me\kern -0.1em V\!/}c^2}}\xspace) }\end{sideways}}    
    \put(80,13){\begin{sideways}\small{ Candidates/(10\ensuremath{{\mathrm{\,Me\kern -0.1em V\!/}c^2}}\xspace) }\end{sideways}} 
    \put(57,47){\small{\mbox{LHCb}\xspace}}
    \put(137,47){\small{\mbox{LHCb}\xspace}}
    \put( 30,0){\small{$\mathrm{M}(\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace\ensuremath{\ensuremath{\ensuremath{\pi}\xspace}\xspace^+\ensuremath{\ensuremath{\pi}\xspace}\xspace^-}\xspace)$}}
    \put(110,0){\small{$\mathrm{M}(\ensuremath{\ensuremath{\psi}\xspace{(2\mathrm{S})}}\xspace\ensuremath{\ensuremath{\ensuremath{\pi}\xspace}\xspace^+\ensuremath{\ensuremath{\pi}\xspace}\xspace^-}\xspace)$}}
    \put( 59,0){\small{$\left[\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c^2}}\xspace\right]$}}
    \put(139,0){\small{$\left[\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c^2}}\xspace\right]$}}
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\end{document}
