Deuteration of c-C3H2 towards the pre-stellar core L1544

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Table 5

Comparison of total column densities in units of × 10¹² cm⁻².

Molecule	N(RADEX)	(MOLLIE)	(MOLLIE)
c-C₃H₂	14(4)	160	30
c-C₃HD	3.8(9)	3.8	0.8
c-C₃D₂	1.8(3)	0.79	0.23

Notes. The column densities derived with MOLLIE (N_M) are given at the chemical times t₁ = 1.0 × 10⁵ yr and t₂ = 1.4 × 10⁵ yr. The best fit for the deuterated species is t₁, and for the main species, it is t₂. The error on the derived values lies within a factor of 2.

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