Comparison between SPOC and K2P² apertures. Left: Median (across sectors) aperture size in pixels against TESS magnitude for stars observed in 120-s cadence for apertures defined by SPOC and the adopted joint custom K2P² + SPOC apertures (see legend). Middle: Number of pixels contributed to the custom apertures by SPOC (i.e., number of pixels not contained in the K2P² aperture) as a function of TESS magnitude. Right: Difference in K2P² and SPOC aperture size relative to the median, with points colour-coded according to TESS magnitude. The dashed horizontal line provides the median level across sectors, while vertical lines indicate shifts in pointing (see legend), typically coinciding with different sectors.