\begin{table}%t2 
\caption{\label{tab_prop}The assumed Orion KL spectral components.}
\small%\centering
\par
\begin{tabular}{lllll}
\hline 
\hline\noalign{\smallskip}
 Parameter & Extended ridge & Compact ridge & Plateau & Hot core\\
 & (ER) & (CR) & (P) & (HC)\\
\hline \noalign{\smallskip}
Source diameter ($''$) & 120 & 15 & 30 & 10 \\
Offset (from IRc2) ($''$) & 0 & 7 & 0 & 2 \\
$n$(H$_2$) (cm$^{-3}$) & $1.0\times10^{5}$ &
$1.0\times10^{6}$ & $1.0\times10^{6}$ & $5.0\times10^{7}$ \\
$T_k$ (K) & 60 & 110 & 125 & 225 \\
$\Delta v_{{\it FWHM}}$ (km s$^{-1}$) & 4 & 4 & 25 & 10 \\
$v_{\rm LSR}$ (km s$^{-1}$) & 9 & 7.5 & 6 & 5.5 \\
\hline
\end{tabular}
\tablefoot{Obtained physical parameters for Orion KL.}
\end{table}