
\documentclass[border=5pt,multi=true]{standalone}
\usepackage{standalone}
\usepackage{afterpage}
\usepackage{color}
\usepackage{ulem}
\usepackage{ifthen}
\usepackage{microtype}
\usepackage{lineno}
\usepackage{xspace}
\usepackage{comment}
\usepackage{graphicx}
\usepackage{color}
\usepackage{colortbl}
\usepackage{graphpap}
\usepackage{rotating}
\usepackage{multirow}
\usepackage{verbatim}
\usepackage{amsmath}
\usepackage{amssymb}
\usepackage{amsfonts}
\usepackage{upgreek}
\usepackage{hyperref}
\usepackage{hypcap}
\usepackage{cite}
\usepackage{mciteplus}
\usepackage{longtable}


\graphicspath{{./figs/}}

\begin{document}
\DeclareGraphicsExtensions{.pdf}
\setlength{\unitlength}{1mm}
  \centering
  \begin{picture}(140,125) %
    \put(0,65){
      \includegraphics*[width=140mm,%
      ]{Fig1a.pdf}
    } 
    \put(0,0){
      \includegraphics*[width=140mm,%
      ]{Fig1b.pdf}
    }
    \put(-2, 15 ) { \small
      \begin{sideways}%
        Candidates/(10\ensuremath{{\mathrm{\,Me\kern -0.1em V\!/}c^2}}\xspace) 
      \end{sideways}%
    }
    \put(-2, 80 ) { \small
      \begin{sideways}%
        Candidates/(10\ensuremath{{\mathrm{\,Me\kern -0.1em V\!/}c^2}}\xspace)
      \end{sideways}%
    } 
    \put(60,64)   { \large  $m_{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace\ensuremath{\ensuremath{\gamma}\xspace}\xspace\ensuremath{\ensuremath{\ensuremath{K}\xspace}\xspace^+}\xspace}$ }
    \put(110,64)   { $\left[ \mathrm{GeV}/c^2\right]$}
    \put(60,-1)  { \large  $m_{\ensuremath{{\ensuremath{J}\xspace\mskip -3mu/\mskip -2mu\ensuremath{\psi}\xspace\mskip 2mu}}\xspace\ensuremath{\ensuremath{\gamma}\xspace}\xspace}$}
    \put(110,-1)  { $\left[ \mathrm{GeV}/c^2\right]$}
    \put( 112, 112  ){ LHCb}
    \put( 112, 47  ){ LHCb}
    \put( 119, 117  ){ a)}
    \put( 119, 52  ){ b)}
  \end{picture}
\end{document}
