Table 5.

Results of calculations of differences using the 4p, 3p and 2p methods.

No	Month	Differences (Ω)
		R 1 ERR	R 2 ERR	R 3 ERR
1	July	0.07	0.03	0.11
2	August	0.04	0.05	0.01
3	September	0.12	0.04	0.08
4	October	0.48	0.60	0.12
5	November	0.43	0.19	0.24
6	December	0.11	0.15	0.26
7	January	0.08	0.17	0.25
8	February	0.10	0.05	0.16
9	March	0.08	1.06	1.15
10	April	0.24	1.03	1.27
11	May	0.13	0.03	0.10
12	June	0.34	0.05	0.28