Table 1. The percentage (%) of hydrogen-bond configurations: double-donor (DD), single-donor (SD), and non-donor (ND) configurations in liquid water from different methods.

Type	Exp a	Method
		CCD b	MP2 c	SPCFW	CPMD d
DD	15 ± 25	50	53	70	79
SD	80 ± 20	42	40	27	20
ND	5 ± 5	8	7	3	1

^aThe experimentally fitted percentage of hydrogen-bond configurations in liquid water from ref. 18.

^bThe EE-GMF approach at the CCD/aug-cc-pVDZ level from this study.

^cThe EE-GMF approach at the MP2/aug-cc-pVDZ level from ref. 53.

^dCPMD simulation results (using PBE0+TS-vdW(SC)) from ref. 47, which utilized the same definition of hydrogen bonds as this study.