TABLE I.

Comparison of accuracy gain and computational overhead of cc-pV6Z-RI$\to 10^{-6}$ ph-projection against canonical cc-pVQZ-RI for molecules in Fig. 2 (geometries and more detailed results are given in the supplementary material). All calculations were carried out at the RPA@PBE/cc-pVQZ level with 12 concurrent evaluation threads on an Intel E5-2620@2.0GHz architecture.

Molecule	A	B	C
Canonical RI error (meV)	30.2	40.9	56.5
ph-projection error (meV)	0.7	0.6	0.8
Total walltime overhead	+27%	+35%	+14%