Left panel: The baseline distribution of the simulated tracking observation for SKA-Low. The grid size is chosen to be |$(6\, {\rm m})^2$| for illustration, and only the central area of |$(3000\, {\rm m})^2$| is shown. The dashed circle indicates the |$k_\perp \sim 1\, {\rm Mpc^{-1}}$| boundary within which the power spectra are calculated. Right panel: The instrument power beam of SKA-Low around the pointing centre.