We identify its Langmuir model parameters K and M from its experimentally measured gravimetric xenon adsorption isotherm [mol Xe/kg adsorbent] in a least-square fitting routine. As opposed to interpolating the experimental adsorption isotherm data to characterize ρ ads Xe (P ), as how we interpolate data to characterize the bulk xenon density ρ Xe (P ), the Langmuir model allows us to extrapolate the adsorbed density to larger pressures than observed in the experiments, which are up to only ca. 1 bar. We exclude adsorbents from our analysis whose adsorption isotherms did not exhibit a plateau, preventing reliable extrapolation of adsorption to higher pressures.