\begin{table}%t5
\par
\caption{\label{tab5}Abundance profiles derived from the observations.}
\small%\centering
\par
\begin{tabular}{lllllllc} 
 \hline \hline  
\multicolumn{1}{l}{\bf Serpens-FIRS 1}  &   
\multicolumn{1}{c}{$X_0$} &
\multicolumn{1}{c}{$R_0$ (AU)} &
\multicolumn{1}{c}{$X_1$} &
\multicolumn{1}{c}{$R_1$} (AU) &
\multicolumn{1}{c}{$X_2$} &
\multicolumn{1}{c}{rms (K km s$^{-1}$)} &  \multicolumn{1}{c}{Diameter($''$)/{\it HPBW}($''$)}\\ \hline 
C$^{18}$O~       &   1.4~$\times$~10$^{-7}$   &  \multicolumn{1}{l}{2000}  &  $<$7~$\times$~10$^{-9}$   &  \multicolumn{1}{l}{6000}  &  1.1~$\times$~10$^{-7}$   & 0.27  & 2.3 \\
N$_2$H$^+$       &   4.0~$\times$~10$^{-10}$  &  \multicolumn{1}{l}{3000}  &  $<$3~$\times$~10$^{-11}$  &  \multicolumn{1}{l}{6000}  &  2.5~$\times$~10$^{-10}$  & 0.29  & 1.9\\  \hline 
N$_2$D$^+$       &   \multicolumn{3}{c}{$<$2~$\times$~10$^{-12}$}          &   \multicolumn{1}{l}{6000}  &  1.9~$\times$~10$^{-11}$  & 0.6  & 3.1 \\ 
 \hline
$T_{\rm ev}^*$ (K)        &   \multicolumn{6}{l}{20 } \\
$n_{\rm ev}^*$ (cm$^{-3}$) &   \multicolumn{6}{l}{2.4~$\times$~10$^6$} \\
  \hline  
\multicolumn{1}{l}{\bf Cep E-mm}  &   
\multicolumn{1}{c}{$X_0$} &
\multicolumn{1}{c}{$R_0$ (AU)} &
\multicolumn{1}{c}{$X_1$} &
\multicolumn{1}{c}{$R_1$} (AU) &
\multicolumn{1}{c}{$X_2$} &
\multicolumn{1}{c}{rms (K km s$^{-1}$)} \\ 
\hline
C$^{18}$O~ &  6.0~$\times$~10$^{-8}$   &   \multicolumn{1}{l}{3500}     &  \multicolumn{3}{c}{1.1~$\times$~10$^{-7}$~$\times$~($r$/35~800)}    & 0.24   & 4.4 \\ 
N$_2$H$^+$ &  2.4~$\times$~10$^{-10}$  &   \multicolumn{1}{l}{6000}      &  \multicolumn{3}{c}{2.5~$\times$~10$^{-10}$~$\times$~($r$/35~800)}    & 0.28 & 3.7 \\  \hline 
N$_2$D$^+$ &  \multicolumn{5}{c}{7.0~$\times$~10$^{-12}$}   &   & 6.1\\
\hline
$T_{\rm ev}$ (K)        &   \multicolumn{6}{l}{20 } \\
$n_{\rm ev}$ (cm$^{-3}$) &   \multicolumn{6}{l}{1.0~$\times$~10$^6$} \\ 
 \hline 
\multicolumn{1}{l}{\bf IC 1396 N}  &   
\multicolumn{1}{c}{$X_0$} &
\multicolumn{1}{c}{$R_0$ (AU)} &
\multicolumn{1}{c}{$X_1$} &
\multicolumn{1}{c}{$R_1$} (AU) &
\multicolumn{1}{c}{$X_2$} &
\multicolumn{1}{c}{rms (K km s$^{-1}$)} \\ \hline
C$^{18}$O~  &  6.0~$\times$~10$^{-8}$  &  \multicolumn{1}{l}{5500}      &  \multicolumn{3}{c}{1.25~$\times$~10$^{-7}$~$\times$~($r$/29~600)}   & 0.24    & 3.5 \\   
N$_2$H$^+$  &  4.2~$\times$~10$^{-10}$ &  \multicolumn{1}{l}{10~000}    &    1.0~$\times$~10$^{-11}$     &    \multicolumn{1}{l}{15~000} &   1.8~$\times$~10$^{-10}$    & 0.50 & 3.0  \\   
N$_2$D$^+$   &  \multicolumn{5}{c}{$<$7~$\times$~10$^{-12}$} &  & 4.9 \\ 
\hline
$T_{\rm ev}$ (K)        &   \multicolumn{6}{l}{19 } \\
$n_{\rm ev}$ (cm$^{-3}$) &   \multicolumn{6}{l}{7.0~$\times$~10$^5$} \\  
 \hline 
\multicolumn{1}{l}{\bf CB3}  &   
\multicolumn{1}{c}{$X_0$} &
\multicolumn{1}{c}{$R_0$ (AU)} &
\multicolumn{1}{c}{$X_1$} &
\multicolumn{1}{c}{$R_1$} (AU) &
\multicolumn{1}{c}{$X_2$} &
\multicolumn{1}{c}{rms (K km s$^{-1}$)} \\ 
\hline
C$^{18}$O~  & 1.3~$\times$~10$^{-7}$       & \multicolumn{1}{l}{25~000}        &   $<$3.0~$\times$~10$^{-8}$   &  \multicolumn{1}{l}{60~000}    &  9.0~$\times$~10$^{-7}$    & 0.24 & 3.7 \\ 
 \hline
N$_2$H$^+$  & \multicolumn{5}{c}{6.5~$\times$~10$^{-10}$}    & 0.45  &  3.1 \\
N$_2$D$^+$ &  \multicolumn{5}{c}{3.0~$\times$~10$^{-11}$}   &  & 5.1 \\  \hline
$T_{\rm ev}$ (K)        &   \multicolumn{6}{l}{15 } \\
$n_{\rm ev}$ (cm$^{-3}$) &   \multicolumn{6}{l}{3.0~$\times$~10$^4$} \\  \hline
\multicolumn{1}{l}{\bf NGC 7129$-$FIRS 2}  &   
\multicolumn{1}{c}{$X_0$} &
\multicolumn{1}{c}{$R_0$ (AU)} &
\multicolumn{1}{c}{$X_1$} &
\multicolumn{1}{c}{$R_1$} (AU) &
\multicolumn{1}{c}{$X_2$} &
\multicolumn{1}{c}{rms (K km s$^{-1}$)} \\ \hline
C$^{18}$O~  &  \multicolumn{5}{c}{4.0~$\times$~10$^{-8}$} & 0.4 & 1.4  \\  
N$_2$H$^+$  &  \multicolumn{5}{c}{4.7~$\times$~10$^{-10}$} & 0.4 & 1.1  \\
 \hline                 
N$_2$D$^+$  &  $<$3.0~$\times$~10$^{-12}$ & \multicolumn{1}{l}{9000} &    4.5~$\times$~10$^{-11}$   &  \multicolumn{1}{l}{11~000}  & $<$3.0~$\times$~10$^{-12}$        & 0.13 & 2.7  \\  
\hline
\end{tabular}
\tablefoot{\tablefoottext{*}{Temperature and density at the CO~evaporation radius.}}
\vspace*{2mm}
\end{table}