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\begin{document}
\begin{tabular}{lrrrrrccc}\hline
\multicolumn{8}{c}{Parameter correlations} &  Values\\
 &$n~~$ & $a~~$ & $\beta$~~ & $\beta_2$~ & $t_0$~~ & $p_1$ & $p_2$ &\\\hline
$n$ &~~1.00 & ~~0.44 & ~~0.57& $-$0.54 &$-$0.86& ~~0.00 & ~~0.00 & ~~$2.082\pm0.036$\,~~~~~~~\\
 $a$ &~~0.44 &~~ 1.00 &~~ 0.74 &$-$0.74 &$-$0.05 & ~~0.00 & ~~0.00 & ~~$1.981\pm0.024$\,ps$^{-1}$\\
$\beta$  &~~0.57 & ~~0.74 & ~~ 1.00 &$-$0.90 &$-$0.37& ~~0.00 & ~~0.00 & ~~$0.077\pm0.009$\,ps$^{-1}$\\
$\beta_2$ &$-$0.54 &$-$0.74 &$-$0.90 & ~~1.00&  ~~0.34& ~~0.00 & ~~0.00 & $-0.008\pm0.001$\,ps$^{-2}$\\
 $t_0$ &$-$0.86&$-$0.05 &$-$0.37 & ~~0.34&  ~~1.00& ~~0.00 & ~~0.00 & ~~$0.104\pm0.003$\,ps~~~~\\
  $p_1$ &~~ 0.00 & ~~0.00 &~~ 0.00 & ~~0.00 & ~~0.00 & ~~1.00 & $-$0.89 & ~~$2.290\pm1.761$\,ps$^{-1}$\\
$p_2$ &~~ 0.00 & ~~0.00 & ~~0.00 & ~~0.00 & ~~0.00 &  $-$0.89 & ~~1.00 & $-0.124\pm0.110$\,~~~~~~~\\\hline
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