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\usepackage{multirow}
\usepackage{ifthen}
\usepackage{microtype}
\usepackage{lineno}
\usepackage{xspace}
\usepackage{graphicx}
\usepackage{color}
\usepackage{colortbl}
\usepackage{amsmath}
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\usepackage{longtable}

\begin{document}
\begin{tabular}{l|l|l|l|l|l|l}
                  & \multicolumn{6}{c}{\protect $ q^2$ \xspace interval [ $ {\mathrm{\,Ge\kern -0.1em V^2\!/}c^4}$ \xspace] }  \\
Source            & 0.00-- & 2.00-- & 4.30-- & 10.09-- & 14.18-- & 16.00-- \\
                  & 2.00   & 4.30   & 8.68   & 12.86   & 16.00   & 20.30\\ \hline
Signal PDF        &  0.08  & 0.08   & 0.16   &  0.4    & 0.08    &  2.3 \\    
Combinatorial
 background       &  2.7~  & 0.7~   & 0.21   &  3.5    & 2.2~    &  2.5 \\    
Signal shape
parameters        &  0.04  & 0.08   & 0.09   &  0.4    & 0.17    &  1.1 \\ \hline
Total             &  2.7~  & 0.7~   & 0.28   &  3.5    & 2.2~    &  3.5 \\ 
\end{tabular}
\end{document}
