
\documentclass[border=5pt,multi=true]{standalone}
\usepackage{standalone}
\usepackage{babel}
\usepackage{ifthen}
\usepackage{multirow}
\usepackage{rotating}
\usepackage{mathrsfs}
\usepackage{ulem}
\usepackage{microtype}
\usepackage{lineno}
\usepackage{xspace}
\usepackage{caption}
\usepackage{graphicx}
\usepackage{color}
\usepackage{colortbl}
\usepackage{amsmath}
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\usepackage{upgreek}
\usepackage{hyperref}
\usepackage{hypcap}
\usepackage{cite}
\usepackage{mciteplus}


\graphicspath{{./figs/}}

\begin{document}
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  \centering
  \begin{picture}(155,120)
    \put(  0, 60){ 
      \includegraphics*[width=75mm,height=60mm,%
      ]{Fig1a.pdf}
    }
    \put( 80, 60){ 
      \includegraphics*[width=75mm,height=60mm,%
      ]{Fig1b.pdf}
    }
    \put(  0,  0){ 
      \includegraphics*[width=75mm,height=60mm,%
      ]{Fig1c.pdf}
    }
    \put( 80,  0){ 
      \includegraphics*[width=75mm,height=60mm,%
      ]{Fig1d.pdf}
    }
    \put(  5,115) { a)~$\begin{array}{l}\mbox{LHCb}\xspace\\ \Upsilon\ensuremath{\ensuremath{\ensuremath{D}\xspace}\xspace^0}\xspace \end{array}$}
    \put( 85,115) { b)~$\begin{array}{l}\mbox{LHCb}\xspace\\ \Upsilon\ensuremath{\ensuremath{\ensuremath{D}\xspace}\xspace^+}\xspace \end{array}$}
    \put(  5, 55) { c)~$\begin{array}{l}\mbox{LHCb}\xspace\\ \Upsilon\ensuremath{\ensuremath{\ensuremath{D}\xspace}\xspace^+_\ensuremath{\ensuremath{s}\xspace}\xspace}\xspace \end{array}$}
    \put( 85, 55) { d)~$\begin{array}{l}\mbox{LHCb}\xspace\\ \Upsilon\ensuremath{\ensuremath{\Lambda}\xspace^+_\ensuremath{\ensuremath{c}\xspace}\xspace}\xspace \end{array}$}
    \put( 3.5,76)  { 
      \begin{rotate}{-32} %
        $m_{\ensuremath{\ensuremath{\ensuremath{K}\xspace}\xspace^-}\xspace\ensuremath{\ensuremath{\ensuremath{\pi}\xspace}\xspace^+}\xspace}~\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c^2}}\xspace\right]$
      \end{rotate}
    }
    \put(83.5,76)  { 
      \begin{rotate}{-32} %
        $m_{\ensuremath{\ensuremath{\ensuremath{K}\xspace}\xspace^-}\xspace\ensuremath{\ensuremath{\ensuremath{\pi}\xspace}\xspace^+}\xspace\ensuremath{\ensuremath{\ensuremath{\pi}\xspace}\xspace^+}\xspace}~\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c^2}}\xspace\right]$
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    }
    \put( 3.5,16)  { 
      \begin{rotate}{-32} %
        $m_{\ensuremath{\ensuremath{\ensuremath{K}\xspace}\xspace^-}\xspace\ensuremath{\ensuremath{\ensuremath{K}\xspace}\xspace^+}\xspace\ensuremath{\ensuremath{\ensuremath{\pi}\xspace}\xspace^+}\xspace}~\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c^2}}\xspace\right]$
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    }
    \put(83.5,16)  { 
      \begin{rotate}{-32} %
        $m_{\mathrm{p}\ensuremath{\ensuremath{\ensuremath{K}\xspace}\xspace^-}\xspace\ensuremath{\ensuremath{\ensuremath{\pi}\xspace}\xspace^+}\xspace}~\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c^2}}\xspace\right]$
      \end{rotate}
    }
    \put( 45,64.0)  { 
      \begin{rotate}{10} %
        $m_{\ensuremath{\ensuremath{\mu}\xspace^+\ensuremath{\mu}\xspace^-}\xspace}~\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c^2}}\xspace\right]$
      \end{rotate}
    }
    \put(125,64.0)  { 
      \begin{rotate}{10} %
        $m_{\ensuremath{\ensuremath{\mu}\xspace^+\ensuremath{\mu}\xspace^-}\xspace}~\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c^2}}\xspace\right]$
      \end{rotate}
    }
    \put( 45, 4.0)  { 
      \begin{rotate}{10} %
        $m_{\ensuremath{\ensuremath{\mu}\xspace^+\ensuremath{\mu}\xspace^-}\xspace}~\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c^2}}\xspace\right]$
      \end{rotate}
    }
    \put(125, 4.0)  { 
      \begin{rotate}{10} %
        $m_{\ensuremath{\ensuremath{\mu}\xspace^+\ensuremath{\mu}\xspace^-}\xspace}~\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c^2}}\xspace\right]$
      \end{rotate}
    }
    \put ( -2,77) { \small \begin{sideways}\mbox{$N/(100\times5\,\mathrm{MeV}^2/c^4)$}\end{sideways}} 
    \put ( -2,19) { \small \begin{sideways}\mbox{$N/(100\times10\,\mathrm{MeV}^2/c^4)$}\end{sideways}} 
    \put ( 78,79) { \small \begin{sideways}\mbox{$N/(100\times5\,\mathrm{MeV}^2/c^4)$}\end{sideways}} 
    \put ( 79,19) { \small \begin{sideways}\mbox{$N/(100\times10\,\mathrm{MeV}^2/c^4)$}\end{sideways}} 
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\end{document}
