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\begin{document}
  
\begin{tabular}{@{} c c c c c c @{} } 
    \toprule
	 \multicolumn{2}{c}{
	 Data sample}	& $N_{\chi\xspace_{ c\xspace\xspace 1}\xspace}$    &   Significance &   $N_{\chi\xspace_{ c\xspace\xspace 2}\xspace}$ &   Significance \\
	\midrule
    \multirow{2}{2.3cm}{ Converted photons}	& $1.5 < y^* < 4.0$ & $41 \pm 9$  &  $6.0$ & $21 \pm 8$  & $3.1$	 \\
        &   $-5.0 < y^* < -2.5$  & $38 \pm 9$	& $4.4$ & $21 \pm 8$ & $3.0$\\
	\midrule
    \multirow{2}{2.3cm}{ing Calorimetric photons}    & $1.5 < y^* < 4.0$ & $1151 \pm 69$  &  $15.7$ & $721 \pm 76$  & $9.8$	 \\
        &   $-5.0 < y^* < -2.5$  & $1004 \pm 73$	& $13.3$ & $676 \pm 82$ & $8.5$\\
	\bottomrule
   \end{tabular}
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