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\usepackage{ifthen}
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\graphicspath{{./figs/}}

\begin{document}
\DeclareGraphicsExtensions{.pdf}
\setlength{\unitlength}{1mm}
  \centering
  \begin{picture}(150,60)
    \put(   0,  0){ 
      \includegraphics*[width=74mm,height=60mm,%
      ]{Fig2a.pdf}
    }
    \put(  76,  0){ 
      \includegraphics*[width=74mm,height=60mm,%
      ]{Fig2b.pdf}
    }
    \put( 111, 46) {\small{$\begin{array}{l}
          \mbox{LHCb}\xspace~\ensuremath{\sqrt{s}}\xspace=7\ensuremath{\mathrm{\,Te\kern -0.1em V}}\xspace
          \\ 6<\ensuremath{p^{\Upsilon}_{\mathrm{T}}}\xspace<8\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c}}\xspace 
          \\ 2.2<\ensuremath{y^{\Upsilon}}\xspace<3.0\end{array}$}}
    \put(15,50){ a) HX~frame}
    \put(90,50){ b)}
    \put( 50, 50 ){\small LHCb}    
    \put(  0, 33 ){\begin{sideways}
        $\frac{\ensuremath{\mathrm{d}} N^{\ensuremath{\Upsilon(1\mathrm{S})}\xspace}}{\ensuremath{\mathrm{d}} \cos\theta}~\left[\frac{1}{0.05}\right]$
      \end{sideways}}
    \put( 76, 33 ){\begin{sideways}
        $\frac{\ensuremath{\mathrm{d}} N^{\ensuremath{\Upsilon(1\mathrm{S})}\xspace}}{\ensuremath{\mathrm{d}} \phi}~\left[\frac{\pi}{0.05}\right]$
      \end{sideways}}
    \put(113,  2) { $\phi/\pi$}  
    \put( 38,  2) { $\cos\theta$}
  \end{picture}
\end{document}
