
\documentclass[border=5pt,multi=true]{standalone}
\usepackage{standalone}
\usepackage{ifthen}
\usepackage{microtype}
\usepackage{lineno}
\usepackage{xspace}
\usepackage{caption}
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\usepackage{graphpap}
\usepackage{subfigure}
\usepackage{wasysym}
\usepackage{array}
\usepackage{pifont}
\usepackage{dashrule}
\usepackage{verbatim}
\usepackage{tikz}


\usetikzlibrary{patterns}


\graphicspath{{./figs/}}

\begin{document}
\DeclareGraphicsExtensions{.pdf}
\setlength{\unitlength}{1mm}
  \centering
  \begin{picture}(150,165)
    \put(  0,110){ 
      \includegraphics*[width=75mm,height=55mm,%
      ]{Fig6a.pdf}
    }
    \put( 75,110){ 
      \includegraphics*[width=75mm,height=55mm,%
      ]{Fig6b.pdf}
    }
    \put(  0, 55){ 
      \includegraphics*[width=75mm,height=55mm,%
      ]{Fig6c.pdf}
    }
    \put( 75, 55){ 
      \includegraphics*[width=75mm,height=55mm,%
      ]{Fig6d.pdf}
    }
    \put(  0,  0){ 
      \includegraphics*[width=75mm,height=55mm,%
      ]{Fig6e.pdf}
    }
    \put( 75,  0){ 
      \includegraphics*[width=75mm,height=55mm,%
      ]{Fig6f.pdf}
    }
    \put( -1,150) { \small \begin{sideways} 
        $\frac{\pi}{\upsigma}\frac{\mathrm{d}\upsigma}{\mathrm{d}\left|\Delta\ensuremath{\phi}\xspace^{\ast}\right|}$
      \end{sideways}} 
    \put( 74,150) { \small \begin{sideways} 
        $\frac{1}{\upsigma}\frac{\mathrm{d}\upsigma}{\mathrm{d}\left|\Delta\ensuremath{\eta}\xspace^{\ast}\right|}$
      \end{sideways}} 
     \put( -1, 97) { \small \begin{sideways} 
        $\frac{1}{\upsigma}\frac{\mathrm{d}\upsigma}{\mathrm{d}\mathcal{A}_{\mathrm{T}}}$
      \end{sideways}} 
    \put( 74,  91) { \small \begin{sideways} 
        $\frac{1}{\upsigma}\frac{\mathrm{d}\upsigma}{\mathrm{d} m^{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace} }$
      \end{sideways}} 
    \put( -3, 38) { \small \begin{sideways} 
        $\frac{1}{\upsigma}\frac{\mathrm{d}\upsigma}{\mathrm{d}p_{\mathrm{T}}^{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace}}$
      \end{sideways}} 
    \put( 74, 38) { \small \begin{sideways} 
        $\frac{1}{\upsigma}\frac{\mathrm{d}\upsigma}{\mathrm{d}y^{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace}}$
      \end{sideways}} 
    \put( 35,110) { $\left|\Delta\ensuremath{\phi}\xspace^{\ast}\right|/\pi$ } 
    \put(110,110) { $\left|\Delta\ensuremath{\eta}\xspace^{\ast}\right|$     } 
    \put( 35, 55) { $\mathcal{A}_{\mathrm{T}}$ } 
    \put(110, 55) { $m^{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace}$ } 
    \put(132, 55) { $\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c^2}}\xspace\right]$}
    \put( 35,  0) { $p_{\mathrm{T}}^{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace}$ } 
    \put( 58,  0) { $\left[\!\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c}}\xspace\right]$}
    \put(110,  0) { $y^{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace}$ } 
    \put(115,152) { \small $\begin{array}{r}\mathrm{LHCb} \\
        \sqrt{s}=7,8\,\mathrm{TeV} \\
        p_{\mathrm{T}}^{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace}>7\ensuremath{{\mathrm{\,Ge\kern -0.1em V\!/}c}}\xspace \end{array}$}
    \put( 16,155) {a)}
    \put( 91,155) {b)}
    \put( 16,100) {c)}
    \put( 91,100) {d)}
    \put( 16, 45) {e)}
    \put( 91, 45) {f)}
    \put(20,155) { \color[rgb]{1,0.747,0}{\begin{tikzpicture}[x=1mm,y=1mm]\draw[thin,pattern=crosshatch, pattern color=Root92]  (0,0) rectangle (12,2.0);\end{tikzpicture}} }
    \put(33,155) { \sc{Powheg} } 
    \put(20,150) { \color[rgb]{0.35,0.83,0.33} {\rule{12mm}{2.2mm}}}
    \put(33,150) { \sc{Pythia} } 
    \put(20,145) { \color[rgb]{1,0,1} {\hdashrule[0.5ex][x]{1.2cm}{0.7pt}{3mm 0.5mm} } } 
    \put(33,145) { \small uncorrelated $\mathrm{b}\bar{\mathrm{b}}$}    
  \end{picture}
\end{document}
