Table 1. The selectivities (S) and the permeances (Q, mol/s/cm²/bar) under different strains for temperatures ranging from 4 to 17 K.

Temperature	4K		5K		8K		10K
strain	S	Q	S	Q	S	Q	S	Q
2%	20.2	2.8 × 10−10	19.8	4.3 × 10−10	18.8	8.7 × 10−10	18.1	1.2 × 10−9
2.5%	14.2	3.8 × 10−9	13.6	5.9 × 10−9	12.4	1.2 × 10−8	11.8	1.6 × 10−8
3%	10.6	4.6 × 10−8	10.2	7.1 × 10−8	9.2	1.5 × 10−7	8.7	2.0 × 10−7
4%	5.4	4.3 × 10−6	5.3	7.1 × 10−6	4.9	1.7 × 10−5	4.5	2.4 × 10−5
Temperature	12K		15K		16K		17K
strain	S	Q	S	Q	S	Q	S	Q
2%	17.3	1.5 × 10−9	15.5	2.0 × 10−9	14.5	2.3 × 10−9	13.4	2.6 × 10−9
2.5%	11.2	2.0 × 10−8	10.0	2.8 × 10−8	9.4	3.2 × 10−8	8.6	3.7 × 10−8
3%	8.1	2.5 × 10−7	7.0	3.7 × 10−7	6.5	4.2 × 10−7	5.9	4.8 × 10−7
4%	4.2	3.2 × 10−5	3.5	4.7 × 10−5	3.3	5.4 × 10−5	3.0	6.3 × 10−5

The red numbers identify the conditions satisfying the industrial acceptable selectivity (>6) and permeance (>6.7 × 10⁻⁸ mol/s/cm²/bar).