Table 3: Comparison of rms values of three instruments.
Observatories Years m $\Delta '$ $\Delta ''$

(G) (G)

CrAO minus WSO 1975-2001 712 0.47 0.50

MWO minus WSO 1975-1982 1442 0.60 0.64

SSO minus WSO 1982-1993 256 0.51 0.62

**Table 3:** Comparison of rms values of three instruments.
Observatories	Years	m	$\Delta '$	$\Delta ''$
			(G)	(G)
CrAO minus WSO	1975-2001	712	0.47	0.50
MWO minus WSO	1975-1982	1442	0.60	0.64
SSO minus WSO	1982-1993	256	0.51	0.62

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