Therefore, the binary predictions at low or high pressures, depending on where we put the weight on the fit, will be compromised (see figure ). In addition, if we fit the data we are not guaranteed to obtain values of the DSL parameters that are physically reasonable. For example, in equation 16 q sat1 and q sat2 are directly related to the saturation uptakes, but the values obtained from the fits do not match the ones from the pure component isotherms. In figure we show how different these values are. Higher differences are observed in structures for which the saturation takes place way beyond 10 bars. Therefore, the fitting is sensitive to the range of data being used.