Median residuals of the PSF model for NOGATE observations in a TYPE-01 device (ROW2 AF4; left two columns) and a TYPE-02 device (ROW3 AF9; right two columns). For each device, the left and right columns correspond to observations with μ̇ - μ̇₀ < -0.37 and μ̇ - μ̇₀ > 0.37 pix s⁻¹, respectively. In the top row the PSF model τ dependence uses a first order spline with no knots. In the bottom row the PSF model τ dependence uses a third order spline with no knots.