(1) the contact corresponds to non-specific interaction; (2) influence of steric effects on A•••B distance can be excluded; (3) line-of-sight contacts distribution contains a line-of-sight peak that is similar to the Gaussian function; (4) addition of the contact to the list of contacts used for van der Waals radii determination does not change any radius significantly (>0.05 Å). This selection is subjective to a certain degree, however, it's well suited for our final goal which was to obtain RvdW corresponding to weak nonspecific interactions that are not affected by any effects. Selected contact types were used for Rmax determination and are marked with '+' sign in the second column of Table . Using the data of Table together with the data on intermolecular contacts allows one to reproduce this work, or to choose another set of contact types to determine another version of Rmax.