Comparison between the previous model of Hébrard et al. (2012) (blue solid line) with the present work (red solid line) for four representative compounds: acetylene C₂H₂, ethane C₂H₆, diacetylene C₄H₂ and benzene C₆H₆. 5th and 15th 20-quantiles (red long-dashed lines) and 1st and 19th 20-quantiles (red short-dashed lines) for the abundances distributions of the present model are also given.