A celestial reference frame derived from observations with the Very Long Baseline Interferometry Global Observing System

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Table 6

Mean difference between formal errors in right ascension and declination estimates for the four CRF solutions with respect to zwd30gr180.

	zwd10gr180	zwd10gr60	zwd10gr20	zwd05gr10
δ < −30°
Δσ_α*	−6	−2	1	5
Δσ_δ	−9	−4	−1	5
−30° < δ < 20°
Δσ_α*	−5	−5	−5	−7
Δσ_δ	−13	−12	−12	−14
δ > 20°
Δσ_α*	−2	−2	−2	−3
Δσ_δ	−3	−3	−4	−4

Notes. The mean value is computed for three groups of sources depending on their declination. Only sources with more than 25 observations are included in the statistics. The units are μas.

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