Influence of PC-SAFT parameters m (number of segments) and σ (segment diameter), representing the size of the considered molecule. Our standard model, corresponding to Fig. 1 panel b, is in blue, while red lines represent the model in which values of (m, σ) for N₂ and C₂ H₆ were exchanged. In order to avoid any misinterpretation, we emphasize that the red lines have no physical meaning, they correspond only to a toy model dedicated to testing the sensivity of parameters.