\begin{table}%t7
%%\centering

\par
\caption{\label{t:lodder}Most important and more abundant rock-forming elements (from \citealt{lodders03}).}          
\small
\begin{tabular}{l c c c}        
\hline\hline
Type of element     &     Element              &   $T_{\rm C}$ ($^\circ$K )  & $a$ (AU)      \\
\hline
Refractory          & Ca,  Al,  Ti             & 1650--1360   &  0.03--0.04   \\
Common              & Fe, Si, Mg               & 1360--1290   &  0.04--0.046  \\
Moderately Volatile &        P                 & 1290--704    &  0.046--0.15 \\
Volatile            & S                        & 704--371     &  0.15--0.48   \\
Highly Volatile     & H, C, N, O +   &    $<$371      &  0.48--$<$5    \\
                    & He, Ne, Ar               &               &                    \\
\hline
\end{tabular}
\end{table}