Upper left: cumulative flux profiles of FDS22_0169 after different sky subtractions. Upper right: azimuthally averaged surface brightness profiles based on the different sky subtraction. The postage stamp images with sky annulus subtraction (lower left) and skyplane subtraction (lower right). The colours denote flux levels above and below surface brightness of 26 magnitudes in 12 levels (i.e. flux range shown is ±f₂₆ = 39.8 × 10⁻¹²). The red ellipse denotes the extent of the galaxy, whilst the two black ellipses show the sky annulus. The white ellipse indicates the outermost elliptical annulus.