Top: evolution of the typical parallax error (crosses) and parallax update (circles) as functions of the iteration number. The typical error settles at around 146 μas. Bottom: evolution of the typical attitude error (crosses) and update (circles) as functions of the iteration number, for the three principal SRS axes x (red), y (blue), and z (black). The errors settle at around 167, 224, and 20 μas, respectively. In both these plots the typical errors and updates are given by the Robust Scatter Estimate (RSE), similar to an rms value (see footnote 18).