\begin{table}%T12
%\centering
\par
\caption{Average [X/H] values, with the corresponding dispersions, for the set of planet host stars and the 
comparison sample.}
\begin{tabular}{lccc}
\hline
\hline
Species & $\langle \rm [X/H]\rangle\pm rms$ & $\langle \rm [X/H]\rangle\pm rms$ & Difference \\
 &  (comp. sample) & (planet hosts) & \\
\hline 
C  & $-0.03\pm0.14$ & $0.14\pm0.17$ & 0.17 \\
S  & $-0.18\pm0.14$ & $-0.02\pm0.17$ & 0.16 \\
Zn & $-0.12\pm0.16$ & $0.13\pm0.22$ & 0.25 \\
Cu & $-0.12\pm0.17$ & $0.19\pm0.23$ & 0.31 \\\hline
\end{tabular}\label{TabAve}			\end{table}