For the pure component isotherms, we observed that the fitting procedure to obtain the DSL parameters is sensitive to initial guesses, i.e., different initial guesses lead to different model parameters. For example, figure shows the results of exemplar fits. In the region where we have abundant data, the different fits give an equally good description. This is not surprising as many combinations of parameters give comparable results. However, for applications where CO 2 concentration is very dilute, it is important that the model accurately covers the Henry regime. Figure also shows that the different initial guesses give very different predictions for the low-pressure regime. In some cases, it was impossible to obtain a meaningful fit that covers both low and high-pressure regions simultaneously.