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\documentclass[aps,pra,reprint,groupedaddress]{revtex4-1}\usepackage{graphicx}\usepackage{longtable}\usepackage{amsmath}\usepackage[caption=false]{subfig}\usepackage{subfig}\usepackage{amssymb}\usepackage{booktabs}
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\begin{table}\centering\begin{tabular}{ccc}\toprule\multicolumn{3}{r}{$k_{20}+k_{21}$($\times$10$^{-9}$cm$^{3}$s$^{-1}$)} \\\cmidrule{2-3}Neutral & Default & New \\Kr &4.02 $\pm$ 0.46~ & 4.17 $\pm$ 0.49 \\Xe & 6.11 $\pm$ 0.72& 6.39 $\pm$ 0.76\\\bottomrule\end{tabular}\caption{\label{comparison}}\end{table}
k20 + k21(×10−9cm3s−1)
Neutral Default New
Kr 4.02 ± 0.46 4.17 ± 0.49
Xe 6.11 ± 0.72 6.39 ± 0.76