\begin{table}%t2
%\centering
\par
%\renewcommand{\arraystretch}{1.2}
\caption{Effect of zonal variations in Earth's rotation: artefacts induced by omitting the variations when transforming the torque from the celestial frame to the terrestrial frame compared to the values of Bretagnon et~al. (\cite{Bretagnon01}), and net contribution.}
\label{ART}
\begin{tabular}{rrrrrrrrr}
\hline\hline
\noalign{\smallskip}
\multicolumn{5}{c}{ }& \multicolumn{2}{c}{Artefact} & \multicolumn{2}{c}{Net effect} \\
%\noalign{\smallskip}
\multicolumn{5}{c}{ }& $\Delta\psi$ & $\Delta\epsilon$ & $\Delta\psi$ & $\Delta\epsilon$ \\
%\noalign{\smallskip}
\multicolumn{5}{c}{ }& $\mu$as & $\mu$as & $\mu$as & $\mu$as\\
%\noalign{\smallskip}
\noalign{\smallskip}
$l$ & $l'$ & $F$ & $D$ & $\Omega$ &sin&cos&sin&cos \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
0& 0& 0& 0& 1&   &   &   & \\
\multicolumn{5}{r}{This study}             &       4&   --729&       1&    --1\\
\multicolumn{5}{r}{Bretagnon et~al. (\cite{Bretagnon01})}  &       4&   --712&        &      \\
\noalign{\smallskip}
0& 0& 0& 0& 2&   &   &   & \\
\multicolumn{5}{r}{This study}             &      71&     19&       0&     0\\
\multicolumn{5}{r}{Bretagnon et~al. (\cite{Bretagnon01})}  &      69&     19&        &      \\
\noalign{\smallskip}
0& 0& 2&--2& 3&   &   &   & \\
\multicolumn{5}{r}{This study}             &       9&     --3&       0&     0\\
\multicolumn{5}{r}{Bretagnon et~al. (\cite{Bretagnon01})}  &       --&     -- &        &      \\
\noalign{\smallskip}
0& 0& 2&--2& 1&   &   &   & \\
\multicolumn{5}{r}{This study}             &      --8&      3&       0&     0\\
\multicolumn{5}{r}{Bretagnon et~al. (\cite{Bretagnon01})}  &       --&    -- &        &      \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
\multicolumn{6}{c}{Precession in longitude}& $\mu$as/c & & \\
\noalign{\smallskip}
\hline
\noalign{\smallskip}
\multicolumn{5}{r}{This study}             & & 4497 & &  \\
\multicolumn{5}{r}{Bretagnon et~al. (\cite{Bretagnon01})}  & & 4224 & &    \\
\hline
\end{tabular}
\end{table}