Table 1: Some c-C3H2 observations of the cores in the TMC-1 ridge.
Source Observed o/p Ratiob Observed X(o-C3H2) $\times\ 10^{-10}$ b Estimated Age (yr)

Cores with high o/p ratio $\cdots$		      

TMC-1A		 $\rm 3.0^{+2.2}_{-1.3}$ $\rm 7.5^{+12}_{-5.4}$ $\sim$106b

TMC-1B		 $\rm 3.0^{+1.7}_{-1.1}$; $3.0\pm0.16$c $\rm 7.9^{+12}_{-5.4}$ $\sim$106-107h

TMC-1E		 $\rm 2.8^{+2.1}_{-1.2}$ $\rm 4.6^{+7.7}_{-3.4}$ $\sim$104-105a,b

Cores with low o/p ratio $\cdots$		      

TMC-1C		 $\rm 1.8^{+0.9}_{-0.6}$; $2.4\pm0.1$c $\rm 6.0^{+8.4}_{-4.0}$; 13e $\sim$105b

TMC-1CP		 $\rm 1.4^{+0.9}_{-0.5}$; $2.56\pm0.31$d $\rm 16^{+32}_{-13}$; 57d $\sim$105f,g; $6 \times 10^4$h

TMC-1Da		 1.4+1.1-0.7 $\rm 8.3^{+19}_{-6.9}$ $6 \times 10^4$h
a Hirahara et al. (1992). Core D is Core CP-b according to this source. b MFK unless noted. The fractional abundances X of o-C3H2 are with respect to H2. 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 (Wakelam et al. 2005). c Takakuwa et al. (2001). d Madden (1990). e Cox et al. (1989). f Saito et al. (2002). g Smith et al. (2004). h Hartquist et al. (2001).


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