Abundance profiles of propane C₃H₈ obtained after 900 runs. Black solid line: initial profile. Black dotted line: median profile obtained from the uncertainty propagation study. Black dashed-dotted lines: 5th and 15th 20-quantiles of the distribution. Black long-dashed lines: 1st and 19th 20-quantiles of the distribution. The blue open diamond refers to ISO observations from Coustenis et al. (2003), the red open triangle to Cassini/INMS observations from Magee et al. (2009), the green crossed squares to Cassini/INMS observations from Cui et al. (2009), the orange square to the corrected Cassini/INMS observations from Cui et al. (2009), the pink crosses to Cassini/CIRS observations at 3.5˚N from Vinatier et al. (2010).