When parameterizing SMD Coulomb radii, we use the a subset of the MNSOL data set (the SMD data set) which was also used by . This subset consists of 384 solvation free energies, of which 59 are for anions and 52 are for cations. Following the original SMD implementation we used mono-aquo microsolvated species for small ions with atoms carrying large (partial) charges. The SMD method is re-parameterized using the gas-phase structures optimized at the respective levels of theory.