. 2025 Apr 8;15:11962. doi: 10.1038/s41598-025-96702-3

Table 2.

Results of ground electrode resistance measurements using the 4p method.

No	Month	Ground electrode resistance R_E (Ω)				Percentage deviation σ_E (%)
No	Month	R_E1 (Ω)	R_E2 (Ω)	R_E3 (Ω)	R_E^AVG,4p (Ω)	σ_E1 (%)	σ_E2 (%)	σ_E3 (%)
1	July	0.200	0.205	0.207	0.204	1.961	0.490	1.471
2	August	0.119	0.121	0.120	0.120	0.833	0.833	0.000
3	September	0.135	0.136	0.136	0.136	0.735	0.000	0.000
4	October	0.845	0.852	0.847	0.848	0.354	0.472	0.118
5	November	0.845	0.842	0.840	0.842	0.356	0.000	0.238
6	December	0.450	0.456	0.449	0.452	0.442	0.885	0.664
7	January	0.465	0.470	0.471	0.469	0.853	0.213	0.426
8	February	0.360	0.364	0.367	0.364	1.099	0.000	0.824
9	March	0.745	0.747	0.747	0.746	0.134	0.134	0.134
10	April	0.871	0.922	0.878	0.890	2.135	3.596	1.348
11	May	0.135	0.139	0.138	0.137	1.460	1.460	0.730
12	June	0.118	0.121	0.115	0.118	0.000	2.542	2.542