Sample raster frames of β Cen from the four BRITEs: BAb (top left), UBr (top right), BLb (bottom left), and BTr (bottom right). The optimal apertures (shown as circles) are shown. Their radii are equal to 7 pixels for BAb and BTr and 9 pixels for BLb and UBr. The gray scale in not linear. Note the smaller raster size (24 × 24 pixels) for BAb observations compared to the rasters from other satellites (28 × 28 pixels).