Table 2. Protonic Density RMSEs Relative to the Reference Density for Different Electronic Basis Sets^a.

molecule	cc-pVnZ				cc-pVnZ-mc
	DZ	TZ	QZ	5Z	DZ	TZ	QZ
FHF–	3.71 × 10–4	2.95 × 10–4	1.84 × 10–4	7.99 × 10–5	1.33 × 10–4	4.18 × 10–5	2.13 × 10–5
HCN	4.03 × 10–4	5.66 × 10–4	2.43 × 10–4	1.14 × 10–4	2.42 × 10–5	1.27 × 10–5	1.82 × 10–5
HNC	8.14 × 10–4	5.33 × 10–4	2.48 × 10–4	9.20 × 10–5	1.64 × 10–4	6.48 × 10–5	6.05 × 10–5

^aThe RMSEs are computed over the set of 3D grid points identical to that used in the fitting procedure in Section 2. All values are in atomic units.