All Tables

Table 1: Derived parameters from the CS (2-1) observations. Sizes and masses assume a distance of 300 pc.
Table 2: Total column densities derived using the LTE assumption (see the text). For the three cores in the "head'' appropriate velocity components were used (see Table 1). The formal errors are 10-15%, which include intensity calibration ( $\sim$ 10%) and spectral noise.
Table 3: H₂ total column densities (in [10²¹ cm^-2]) obtained from ¹³CO using a conversion factor of N (H₂)/N ( $^{13}{\rm CO})=4.8\times 10^5$ (Dickman & Clemens 1983) and from C¹⁸O using the ratio [C¹⁸O]/[H₂] = 1.7 $\times 10^{-7}$ (Frerking et al. 1982), and the calculated fractional abundances of the main isotopomers with respect to [H₂] derived from [C¹⁸O].
Table 4: The results of the CH₃CCH rotational diagram method weighted with observational errors plus E, A species uncertainties (case I) and using the K=1 and K=2 lines only (case II). Ammonia temperatures are from TW.
Table 5: Ratios of column densities, based on Table. 3. Relative errors of the ratios are in the range of 5-15%, for SO, CS, HCO⁺ and HNC. For ratios that include ammonia, errors are in the range 20-25%.