where the 1-b term is the monomer potential and the 2-b and 3-b terms are the corresponding "short-range" 2 and 3-b interactions. E P OL is the TTM4-F potential (without monomer terms) which describes the full N -monomer polarization interactions using standard longrange expressions. The terminology "short-range" is equivalent to the difference potentials ∆V 2-b and ∆V 3-b , and E P OL is the same as V MB-FF , which for MB-pol is TTM4-F. Note that the CCSD(T) corrections in MB-pol potential extend to 3-b terms.