SUPLEMENTARY INFORMATION CBS extrapolation in electronic structure pushed to end: A revival of minimal and sub-minimal basis sets A.J.C. Varandas *,†,‡ †School of Physics and Physical Engineering, Qufu Normal University, 273165 Qufu, China. ‡Chemistry Centre and Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal E-mail: varandas@uc.pt Table 1: TS-106 and TS-106’ of molecular systems # in TS-106 Formula Name # in TS-106’ 1 CFN Cyanogen fluoride 1 2 CFN Isocyanogen fluoride 2 3 CF 2 Singlet difluoromethylene 3 4 CF 2 O Carbonyl fluoride 4 5 CF 4 Tetrafluoromethane 5 Continued on next page 1 Electronic Supplementary Material (ESI) for Physical Chemistry Chemical Physics. This journal is © the Owner Societies 2018