As can be expected, the range of purity that can be obtained in the process depends on the concentration of CO 2 in the inlet gas and, in this case and for the evaluated TSA process, purity is lowest for the confined spaces. This is best illustrated in figure . If we focus on the ranking of the materials in figure , we see for the coal case that the top-performing materials all give a similar purity, independently of the method that is used. However, if we go to natural gas or confined spaces, the order of the materials does depend on the method that is used, which corroborates the conclusion of the previous section that at low concentrations the differences between DSL and IAST can be significant. Interestingly, if we give more weight to the low-pressure regime we tend to underestimate the purity (more red lines) and without this weight, we overestimate (more blue). However, this trend is not true for all structures. Similar conclusions hold for other key performance indicators, such as the working capacity and specific heat requirements (see section 3.1 in the SI).