Table 1. Outcomes of the Electronic Embedding Calculations for the Reference Configuration Selection.

No. of configurations	Transition Energy	Transition Dipole Strength	No. of atoms
30 Å sphere
1	2.4800 eV (499.94 nm)	0.0025	1679
5	2.4716 eV (501.64 nm)	0.0027	8320
10	2.4784 eV (500.25 nm)	0.0028	16618
15	2.4780 eV (500.34 nm)	0.0028	24911
20	2.4778 eV (500.39 nm)	0.0028	33226
25	2.4766 eV (500.61 nm)	0.0029	41398
30	2.4773 eV (500.48 nm)	0.0029	49843
35	2.4833 eV (499.27 nm)	0.0029	58065
40	2.4794 eV (500.06 nm)	0.0029	66249
45	2.4771 eV (500.52 nm)	0.0026	74546
50	2.4812 eV (499.70 nm)	0.0029	82896
55	2.4768 eV (500.57 nm)	0.0029	91228
60	2.4770 eV (500.54 nm)	0.0029	99591
65	2.4757 eV (500.79 nm)	0.0028	107783
70	2.4795 eV (500.04 nm)	0.0029	115966
40 Å sphere
1	2.4805 eV (499.83 nm)	0.0025	3933
5	2.4717 eV (501.62 nm)	0.0027	19599
10	2.4785 eV (500.23 nm)	0.0028	39204
15	2.4780 eV (500.34 nm)	0.0028	58749
20	2.4816 eV (499.62 nm)	0.0030	78227
25	2.4766 eV (500.62 nm)	0.0029	97836
30	2.4774 eV (500.47 nm)	0.0029	117470
35	2.4833 eV (499.28 nm)	0.0029	137038
Full box configuration
20	2.4799 eV (499.96 nm)	0.0029	137180
Mean electric field configuration
1	2.4850 eV (498.94 nm)	0.0029	6859