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\begin{document}
\begin{tabular}{l|rrrrrrrr}
 & $F_{\rm L}$ & $P_1$ & $P_2$ & $P_3$ & $P'_4$ & $P'_5$ & $P'_6$ & $P'_8$ \\
\hline
$F_{\rm L}$ &  $1.00 $ &   $-0.05 $ &   $0.33 $ &   $0.08 $ &   $0.08 $ &   $0.13 $ &   $0.01 $ &   $0.03 $ \\     
$P_1$ & &   $1.00 $ &   $0.05 $ &   $0.05 $ &   $-0.14 $ &   $-0.21 $ &   $0.02 $ &   $0.01 $ \\   
$P_2$ & & &   $1.00 $ &   $0.03 $ &   $-0.10 $ &   $-0.07 $ &   $-0.01 $ &   $0.02 $ \\    
$P_3$ & & & &  $1.00 $ &   $-0.02 $ &   $-0.06 $ &   $0.15 $ &   $0.07 $ \\    
$P'_4$ & & & & &   $1.00 $ &   $0.24 $ &   $0.04 $ &   $-0.07 $ \\   
$P'_5$ &  &  &  & & &   $1.00 $ &   $-0.07 $ &   $0.03 $ \\  
$P'_6$ &  &  & & &  & &  $1.00 $ &   $0.14 $ \\    
$P'_8$ & &  & & &  &  & &   $1.00 $ \\     
\end{tabular}
\end{document}
