Effects of AL variations in the CCD response on the PSF, and the dependence on source motion. Each plot shows the difference between two integrated effective PSFs for τ̇ = τ̇₀ and μ̇ - μ̇₀ = ±1.0 pix s⁻¹, such that the PSFs are smeared exclusively in the AC direction. The PSFs are for NOGATE, so the entire τ range of the CCD is covered. Due to the AC motion, the lower half of each plot shows the approximate difference between the instantaneous effective PSF at high τ minus the instantaneous effective PSF at low τ, and vice-versa in the upper half. The lower panel is a TYPE-01 device (ROW2 AF4) and the upper panel is a TYPE-02 device (ROW3 AF9).