M 83 (NGC 5236) azimuthal elliptical–radial surface brightness profiles (Vega mag arcsec ⁻²), comparing WISE (black line) with IRAC and MIPS-24 (magenta line). A double Sérsic function (gray dashed line) is fit to the WISE radial profile, where the blue dashed line is the "bulge" component and the magenta dashed line is the "disk" component. Additionally, the GALEX NUV and FUV radial profiles are shown in the W3 and W4 panels (note that the GALEX AB magnitudes have been offset by ~7 mag to fit within the y-axis dynamic range).