\begin{table}%T2
%\centering
\par
\caption{Mean orbital parameters of the Meyer and Marsden \&
Kracht groups of sungrazing comets (respectively, a total of 40
and 39 comets in the samples).} \label{tab2}
\begin{tabular}{lcc}
  \hline\hline
  \multicolumn{3}{c}{{\it Meyer Group}}                  \\
  Parameter                         & Value      & Std. dev. \\
  \hline
  Perihelion longitude [\degr]      & 98.8       & 1.3   \\
  Perihelion latitude  [\degr]      & 53.0       & 1.4   \\
  Perihelion distance  [$R_{\odot}$]& 7.7        & 0.4  \\
  Inclination          [\degr]      & 72.2       & 1.3   \\
  Perihelion argument  [\degr]      & 57.0       & 1.2   \\
  Node                 [\degr]      & 73.6       & 1.3   \\
  \hline
  \multicolumn{3}{c}{{\it Marsden \& Kracht Group}}      \\
  Parameter                         & Value      & Std. dev. \\
  \hline
  Perihelion longitude [\degr]      & 101.9      & 2.4   \\
  Perihelion latitude  [\degr]      & 10.8       & 1.1   \\
  Perihelion distance  [$R_{\odot}$]& 9.90       & 0.96  \\
  Inclination          [\degr]      & 18.5       & 6.9   \\
  Perihelion argument  [\degr]      & 45.5       & 19.0   \\
  Node                 [\degr]      & 57.7       & 20.0   \\
  \hline
\par
\end{tabular}
\end{table}