These noncovalent benchmarks help to explain why the error patterns for PBE (Fig. ) and SCAN (Fig. ) are qualitatively different. SIE drives delocalization that stabilizes clusters relative to their constituent monomers, and stabilizes larger clusters relative to smaller ones. The lack of SIE in the smaller fragments is overrepresented in the MBE(n) as system size and expansion order increases, which is more readily seen if the n-body corrections are written in closed form, 13