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\usepackage{longtable}

\begin{document}
  
  
  
  \begin{tabular}{ l | l l l l l l l}
   \hline
              &  $\gamma$ \xspace              &  $ r_B^{DK}$ \xspace             &  $\delta_B^{DK}$ \xspace             &  $ r_B^{DK^{*0}}$ \xspace        &  $\delta_B^{DK^{*0}}$ \xspace        &  $ r_B^{D\pi}$ \xspace           &  $\delta_B^{D\pi}$ \xspace           \\
   \hline
     $\gamma$ \xspace        & \phantom{-}1    & \phantom{-}0.19 & \phantom{-}0.23 & \phantom{-}0.10 & -0.07           & -0.59           & -0.22           \\
     $ r_B^{DK}$ \xspace       & \phantom{-}0.19 & \phantom{-}1    & \phantom{-}0.23 & \phantom{-}0.02 & \phantom{-}0    & -0.20           & \phantom{-}0.02 \\
     $\delta_B^{DK}$ \xspace       & \phantom{-}0.23 & \phantom{-}0.23 & \phantom{-}1    & \phantom{-}0.02 & \phantom{-}0    & -0.09           & \phantom{-}0.42 \\
     $ r_B^{DK^{*0}}$ \xspace  & \phantom{-}0.10 & \phantom{-}0.02 & \phantom{-}0.02 & \phantom{-}1    & -0.10           & -0.06           & -0.03           \\
     $\delta_B^{DK^{*0}}$ \xspace  & -0.07           & \phantom{-}0    & \phantom{-}0    & -0.10           & 1               & \phantom{-}0.04 & \phantom{-}0.03 \\
     $ r_B^{D\pi}$ \xspace     & -0.59           & -0.20           & -0.09           & -0.06           & \phantom{-}0.04 & 1               & \phantom{-}0.45 \\
     $\delta_B^{D\pi}$ \xspace     & -0.22           & \phantom{-}0.02 & \phantom{-}0.42 & -0.03           & \phantom{-}0.03 & \phantom{-}0.45 & 1               \\
   \hline
  \end{tabular}
\end{document}
