Dependence of the faint reference frame on colour. The diagram shows the components of spin ωX, ωY, and ωZ around the ICRS axes, as estimated for faint (G ≃ 15–21) quasars subdivided by effective wavenumber. The components in X and Z were shifted by ± 0.2 mas yr−1 for better visibility. Error bars are at 68% confidence intervals for the estimated spin.
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