The applicability ranges for the different contributions are limited by originally fitting within m 1 /m 2 ≤ 8, σ 1 /σ 2 ≤ 1.25, and ε 1 /ε 2 ≤ 1.75. Moreover, the Soret coefficient is not given in Lennard-Jones units but in [10 -3 K -1 ]. Hence, S RMP T has to be adjusted to the present unit system.