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\begin{document}
\begin{tabular}{l c c}
\hline
Background sources & 2011 data & 2012 data \\
\hline
 $ B^0\to  { J\xspace\mskip -3mu/\mskip -2mu\psi\xspace\mskip 2mu}\xspace \pi^+\pi^-$ \xspace & $\phantom{0}51 \pm 10\phantom{0}$ & $115 \pm 23\phantom{0}$ \\
 $ B^0_s\to  { J\xspace\mskip -3mu/\mskip -2mu\psi\xspace\mskip 2mu}\xspace \pi^+\pi^-$ \xspace & $\phantom{0}9.3 \pm 2.1\phantom{0}$ & $25.0\pm 5.4\phantom{0}$\\
 $ B^0_s\to  { J\xspace\mskip -3mu/\mskip -2mu\psi\xspace\mskip 2mu}\xspace K^+K^-$ \xspace & $10.1 \pm 2.3\phantom{0}$ & $19.2 \pm 4.0\phantom{0}$ \\
 $\Lambda^0_b\xspace\to { J\xspace\mskip -3mu/\mskip -2mu\psi\xspace\mskip 2mu}\xspace\xspace p K^-$ \xspace & $\phantom{0}36 \pm 17\phantom{0}$ & $\phantom{0}90 \pm 43\phantom{0}$ \\
 $\Lambda^0_b\xspace\to { J\xspace\mskip -3mu/\mskip -2mu\psi\xspace\mskip 2mu}\xspace\xspace p \pi^-$ \xspace & $13.8 \pm 5.3\phantom{0}$ & $27.3 \pm 9.0\phantom{0}$ \\
\hline
\end{tabular}
\end{document}
