Impact of sampling visibilities due to a source 60° away from the phase center (ψ = 60°) on a circular uv track of radius 10 (u₀ = 10) followed by convolution with a gridding kernel corresponding to a FoV of 15° (f = 15°). The different panels show the visibilities along the uv track (top left, Eq. (B.1)), the convolution kernel (top right), the sampled visibilities convolved with the kernel (bottom left, Eq. (B.2)) and the absolute value of the convolved visibilities (bottom right). The amplitudes of the convolved visibilities for a few other FoVs are overplotted in the bottom right panel as blue dashed lines.