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\usepackage{booktabs}

\begin{document}
  
\begin{tabular}{llr}
    \toprule
\multicolumn{2}{c}{$k$} & \multicolumn{1}{c}{$I_k/I_0$} \\
\midrule
  $1$ & $(00)$ & $0.9801\pm0.0014$ \\
  $2$ & $(\parallel\parallel)$ & $1.0200\pm0.0017$\\
  $3$ & $(\perp\perp)$ & $1.0209\pm0.0016$\\
  $4$ & $(\parallel\perp)$ & $0.0003\pm0.0018$\\
  $5$ & $(0\parallel)$ & $0.0008\pm0.0012$\\
  $6$ & $(0\perp)$ & $0.0015\pm0.0012$\\
  $7$ & (SS) & $0.9983\pm0.0011$\\
  $8$ & (S$\parallel$) & $0.0004\pm0.0016$\\
  $9$ & (S$\perp$) & $0.0012\pm0.0016$\\
  $10$ & (S$0$) & $-0.0067\pm0.0036$\\
    \bottomrule
  \end{tabular}
\end{document}
