Table 3 Rotational, drift and bias components of the transformation between the ICRF3 catalogues and ICRF3-derived catalogues that have incorporated VGOS observations, in the case of (a) unconstrained (A1), and (b) constrained solution (A2) (in parentheses) with respect to nutation and polar motion. The estimates are given in \(\mu\)as except for \(D_{\alpha }\) and \(D_{\delta }\) where they are in \(\mu\)as/rad

From: Evaluation of the first three years of Vgos 24 h sessions using a Kalman filter with C5++