Properties of TESS pixel stamps for 120-s (top row) and 20-s (bottom row) cadence observations. First column: Median pixel stamp width and height across sectors for individual stars as a function of their TESS magnitude. Second (third) column: Stamp width (height) as a function of sector, coloured by TESS magnitude. Width values have been dithered by up to ±0.5 pixels to show any dependence on magnitude better. Vertical lines indicate changes in pointings (see Fig. B.1, right panel). For the heights, red markers indicate stars that are found to have a pixel stamp height that is smaller than two or more fainter stars, i.e., breaking with the general monotonic increase in stamp height with decreasing TESS magnitude seen on the first column. Fourth column: Total stamp size as a function of sector, colour-coded according to TESS magnitude.