The data sets acquired for three SP are slightly different, because some compounds are not eluted at reasonable temperatures on some SP, compounds with RI > 3500 are not included in the considered data set (low accuracy of the RI determination in these cases) and due to other reasons. The information about the overlap of these data sets is provided in Supplementary material, Fig. . In the previous sections, we demonstrated that even a small difference in a data set severely affects the set of selected MD and their importance. Therefore, the comparison of the sets of selected MD was performed using the "intersection" data set. For each compound from this data set, RI is available for all three IL, as well as for 5%-phenyl-methylpolysiloxane (also denoted as DB-5 for conciseness, after the common column with such SP) and for polyethylene glycol . It should be noted that such incorrect comparison was made in previous works. For example, in Ref. (Journal of Chromatography A), the authors built QSRR for 4 SP having significantly different data sets (different in dozens of compounds). The authors selected MD using a sequential algorithm and commented on the chemical nature of the separation based on the selected MD set.