\begin{table}%t1
\caption{Some c-C$_{3}$H$_{2}$ observations of the cores in the TMC-1 ridge.\label{op-obs}}     

\begin{tabular}{llll} 
	\hline    \hline     
%	\noalign{\smallskip}  
%	\noalign      
	Source     &  Observed $o/p$ Ratio$^b$       		& Observed $X$($o$-C$_3$H$_2$) $\times\ 10^{-10}$ $^{b}$  & Estimated Age (yr) \\\noalign{\smallskip}        
	\hline\noalign{\smallskip}         
	{\it Cores with high $o/p$ ratio\ $\cdots$}   		& 	        &              	& \\\noalign{\smallskip}        
	TMC-1A      & $\rm 3.0^{+2.2}_{-1.3}$    	    		& $\rm 7.5^{+12}_{-5.4}$	& $\sim$10$^6$$^b$ \\\noalign{\smallskip}        
	TMC-1B      & $\rm 3.0^{+1.7}_{-1.1}$; $3.0\pm0.16$$^{c}$   & $\rm 7.9^{+12}_{-5.4}$	& $\sim$10$^6$--10$^7$$^h$ \\\noalign{\smallskip}        
	TMC-1E      & $\rm 2.8^{+2.1}_{-1.2}$   	 	    	& $\rm 4.6^{+7.7}_{-3.4}$	& $\sim$10$^4$--10$^5$$^{a,b}$ \\\noalign{\smallskip}         
	{\it Cores with low $o/p$ ratio\ $\cdots$}    	&       &              	& \\\noalign{\smallskip} 
        TMC-1C      & $\rm 1.8^{+0.9}_{-0.6}$; $2.4\pm0.1$$^{c}$    & $\rm 6.0^{+8.4}_{-4.0}$; 13$^{e}$	& $\sim$10$^5$$^b$ \\  \noalign{\smallskip}        
        TMC-1CP     & $\rm 1.4^{+0.9}_{-0.5}$; $2.56\pm0.31$$^{d}$  & $\rm 16^{+32}_{-13}$; 57$^{d}$ 	& $\sim$10$^5$$^{f,g}$; $6 \times 10^4$$^h$ \\  \noalign{\smallskip}        
        TMC-1D$^a$  & \rm $1.4^{+1.1}_{-0.7}$                      	& $\rm 8.3^{+19}_{-6.9}$ 		 		& $6 \times 10^4$$^h$ \\      
	\hline      
	\end{tabular} 
\smallskip
	   $^a$ \citet{TMC-1-CP-b}. Core D is Core CP-b according to this source. 
 	   $^b$ MFK unless noted. The fractional abundances $X$ of 
	   $o$-C$_{3}$H$_{2}$ are with respect to H$_{2}$.  Based on the MFK logarithmic observables,
		we carried out slightly different error calculations, because here
		$\Delta$ log~$X$ is not much less than~1, so that two 1$\sigma$ random errors $\Delta{X}_{-}\napprox\Delta{X}_{+}$   should be calculated \citep{wakelam}.		 	   $^c$ \citet{Ref:opC3H2}.
 	   $^d$ \cite{madphd}. 
	   $^e$ \citet{cox-c3h2}.
	   $^f$ \citet{age-D}.
	   $^g$ \citet{smith04}.	
	   $^h$ \citet{Ref:ism-3-2}. 
     	 	\end{table}