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\graphicspath{{./figs/}}

\begin{document}
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  \centering
  \begin{picture}(155,122)
    \put(  0, 62){ 
      \includegraphics*[width=75mm,height=60mm,%
      ]{Fig7a_new.pdf}
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    \put(  80,62){ 
      \includegraphics*[width=75mm,height=60mm,%
      ]{Fig7b_new.pdf}
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    \put(  0, 00){ 
      \includegraphics*[width=75mm,height=60mm,%
      ]{Fig7c.pdf}
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    \put( 80,  0){ 
      \includegraphics*[width=75mm,height=60mm,%
      ]{Fig7d.pdf}
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    \put ( -3, 92) { \begin{sideways}$\tfrac{1}{\upsigma}\tfrac{\ensuremath{\mathrm{d}}\upsigma}{\ensuremath{\mathrm{d}}\ensuremath{p^{\Upsilon}_{\mathrm{T}}}\xspace}~~~\left[\tfrac{1}{1\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c}}\xspace}\right]$\end{sideways}} 
    \put ( 77, 92) { \begin{sideways}$\tfrac{1}{\upsigma}\tfrac{\ensuremath{\mathrm{d}}\upsigma}{\ensuremath{\mathrm{d}}\ensuremath{p^{\Upsilon}_{\mathrm{T}}}\xspace}~~~\left[\tfrac{1}{1\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c}}\xspace}\right]$\end{sideways}} 
    \put ( -3, 30) { \begin{sideways}$\tfrac{1}{\upsigma}\tfrac{\ensuremath{\mathrm{d}}\upsigma}{\ensuremath{\mathrm{d}}\ensuremath{p^{\ensuremath{\mathsf{C}}\xspace}_{\mathrm{T}}}\xspace}~~~\left[\tfrac{1}{1\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c}}\xspace}\right]$\end{sideways}} 
    \put ( 77, 30) { \begin{sideways}$\tfrac{1}{\upsigma}\tfrac{\ensuremath{\mathrm{d}}\upsigma}{\ensuremath{\mathrm{d}}\ensuremath{p^{\ensuremath{\mathsf{C}}\xspace}_{\mathrm{T}}}\xspace}~~~\left[\tfrac{1}{1\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c}}\xspace}\right]$\end{sideways}} 
    \put( 35,  63) { $p^{\ensuremath{\Upsilon\mathrm{(1S)}}\xspace}_{\mathrm{T}}$ } \put( 58, 63) { $\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c}}\xspace\right]$ }  
    \put(115,  63) { $p^{\ensuremath{\Upsilon\mathrm{(1S)}}\xspace}_{\mathrm{T}}$ } \put(138, 63) { $\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c}}\xspace\right]$ }  
    \put( 35,   1) { $p^{\ensuremath{\ensuremath{\ensuremath{D}\xspace}\xspace^0}\xspace}_{\mathrm{T}}$ }  \put(  58, 1) { $\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c}}\xspace\right]$ }  
    \put(115,   1) { $p^{\ensuremath{\ensuremath{\ensuremath{D}\xspace}\xspace^+}\xspace}_{\mathrm{T}}$ }  \put( 138, 1) { $\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c}}\xspace\right]$ }  
    \put( 45,110) { a)~$\begin{array}{l} \mbox{LHCb}\xspace \\ \ensuremath{\Upsilon\mathrm{(1S)}}\xspace\ensuremath{\ensuremath{\ensuremath{D}\xspace}\xspace^0}\xspace\end{array}$ }
    \put(125,110) { b)~$\begin{array}{l} \mbox{LHCb}\xspace \\ \ensuremath{\Upsilon\mathrm{(1S)}}\xspace\ensuremath{\ensuremath{\ensuremath{D}\xspace}\xspace^+}\xspace\end{array}$ }
    \put( 45, 48) { c)~$\begin{array}{l} \mbox{LHCb}\xspace \\ \ensuremath{\Upsilon\mathrm{(1S)}}\xspace\ensuremath{\ensuremath{\ensuremath{D}\xspace}\xspace^0}\xspace\end{array}$ }
    \put(125, 48) { d)~$\begin{array}{l} \mbox{LHCb}\xspace \\ \ensuremath{\Upsilon\mathrm{(1S)}}\xspace\ensuremath{\ensuremath{\ensuremath{D}\xspace}\xspace^+}\xspace\end{array}$ }
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\end{document}
