\begin{table}%t3
%\centering
\par
\caption{The main terms of LEA-406a harmonic development of lunar geocentric distance $r$.
\label{Table3}}
% %\centering
 % used for centering table
% \begin{tabular}{cccccccc} % centered columns (8 columns)
 \begin{tabular}{@{}cccccccc@{}} % centered columns (8 columns)
\hline\hline
\noalign{\smallskip}
\multicolumn{4}{c}{Argument} & Period & $A_0^{(r)}$ &  $A_1^{(r)}$ &  $A_2^{(r)}$ \\ % table heading
$l$ & $l'$ & $F$ & $D$ & 
% $\Omega$ & $\lambda_{Me}$ & $\lambda_{Ve}$ & $\lambda_{Ea}$ & $\lambda_{Ma}$ & 
% $\lambda_{Ju}$ & $\lambda_{Sa}$ & $\lambda_{Ur}$ &  $\lambda_{Ne}$ &  $p_A$ & 
[d] & [km] & [km/th.y] & [km/(th.y)$^2$] \\   
\noalign{\smallskip}
\hline % inserts single horizontal line
\noalign{\smallskip}
  0  &   0  &   0   &  0  &  
% 0  &  0   &  0   &  0   &  0  &   0   &  0  &   0   &  0  &   0 & 
-- & 385000.539 & 0.023 & 0.000 \\
  1   &  0 &    0   &  0   &  
% 0   &  0  &   0   &  0   &  0   &  0  &   0   &  0   &  0   &  0 & 
27.55&20905.345 & 0.178 & 5.103 \\
 --1   &  0   &  0  &   2   &  
% 0   &  0  &   0   &  0  &   0  &   0   &  0  &   0   &  0   &  0 & 
31.81&3699.161 & 0.083 & 1.157 \\
  0   &  0  &   0  &  2  &   
% 0   &  0   &  0  &   0  &   0   &  0   &  0   &  0  &   0  &   0 & 
14.77&2955.984 & 0.137 & 1.626 \\
  2   &  0   &  0  &   0   &  
% 0  &  0  &   0  &   0   &  0   &  0  &   0  &   0   &  0  &   0 & 
13.78&569.925 & 0.010 & 0.279 \\
 --2   &  0   &  0   &  2  &   
% 0   &  0   &  0   &  0   &  0   &  0   &  0   &  0   &  0   &  0 & 
205.89&246.161 & 0.007 & 0.023 \\
  0   & --1  &   0  &   2 &   
% 0   &  0   &  0 &   0   &  0   &  0   &  0  &   0   &  0  &   0 & 
15.39&204.590 & 5.139 & 0.205 \\
  1   &  0  &   0  &   2  &   
% 0  &   0  &   0   &  0   &  0   &  0  &   0   &  0    & 0   & 0 & 
9.61&170.734 & 0.012 & 0.137 \\
 --1   & --1  &   0   &  2   &  
% 0  &   0  &   0   &  0   &  0    & 0   &  0   &  0  &   0   &  0 & 
34.85&152.142 & 3.824 & 0.132 \\
 --1  &   1  &   0   &  0  &   
% 0   &  0   &  0   &  0   &  0   &  0   &  0   &  0   &  0    & 0 & 
29.80&129.625 & 3.265 & 0.111 \\
  0   &  0   &  0   &  1   &  
% 0    & 0   &  0   &  0   &  0   &  0   &  0  &   0   &  0  &   0 & 
29.53&108.747 & 0.001 & 0.029 \\
  1   &  1   &  0   &  0   &  
% 0  &   0  &   0   &  0   &  0   &  0   &  0   &  0   &  0  &   0 & 
25.62&104.759 & 2.639 & 0.082 \\
\noalign{\smallskip}
\hline
\end{tabular} 
\end{table}