Results for BE models with M = 0.5 M_⊙ and ⟨T_kin⟩=10 K, for T_kin increasing outwards. The frames from left to right correspond to the combination of 1-4 lowest rotation transitions of CS and C³⁴S. The rows correspond to three assumptions of the C³⁴S abundance (middle row with the correct value). Contours are drawn at χ²=1, 2, 10, and 100 (red, cyan, magenta, and blue colours, respectively). The cyan circles indicate the reference values for the central line of sight (smallest circle), for the FWHM = R₀/3 beam (as used for the input synthetic observations), and for the FWHM = R₀ beam (largest circle).