RPE performance in 360 nominal (top row) and 243 short (bottom row) VIS science exposures. The blue histograms are based on the AOCS controller-error vector, and the orange ones on the FGS-provided absolute quaternion. The dashed vertical lines show the 3 σ allocation by industry. Even though that requirement is not always met in practice, in particular about the z-axis, it does not mean that the PSF requirements are violated, because there are also margins on the optical PSF.