Results of our best-fit model (ζ_H2 = 4.0 × 10^-17 s^-1, O/H = 3.0 × 10^-5, N/H = 6.4 × 10^-5, C/H = 1.7 × 10^-5, and S/H = 6.0 × 10^-7). We assume a density of n(H₂) = 10⁵ cm^-3 and T_k = 12 K. The thick and dashed blue lines indicate the observed values and their uncertainty, which are considered to be a factor of 2 for most molecules (see text), respectively. In the case of SO, SO₂, and OCS, their abundances change by more than a factor of 2 between the 6.5 km s^-1 and 7.0 km s^-1 velocity components. In the panels corresponding to these species, the dashed lines indicate the abundance for each component separately. In red we show model calculations for the same conditions and n(H₂) = 10⁴ cm^-3.