Fig. 3
Map of χ2 values as a function of α and c obtained by matching the parametrized BET isotherm (Eqs. (3)–(6)) and the experimental isotherm for ethane adsorption on tholin (Curtis et al. 2008). The best value is obtained for α = 9.05 × 10−12 and c = 0.067. The second contour (blue) indicates the 2σ level. This contour is used to provide an idea of the uncertainties on the values of α and c, and further on the energy terms.
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