Notes. The values give the maximum limits. The science requirements refer to the knowledge of the PSF at a fiducial wavelength of 800 nm and a maximum integration time of 700 s. The spacecraft requirements (column 3) give the derived allocations for the spacecraft. The science and spacecraft requirements for the bottom two lines refer to a period 700 s and 11 000 s, respectively. ^(†)$R_{\text{ref}}^2$ is based on a Gaussian profile with a FWHM of $0_{\cdot }^{\mathrm{\prime }\mathrm{\prime }}2$.