IRAC images of NGC 5291 and the Seashell galaxy, showing 3.6 μm emission (top left), 3.6 μm emission with surface brightness contours (top right), "nonstellar" emission (bottom left), and "nonstellar" emission after smoothing with a 5^{﹩\arcsec﹩} Gaussian kernel (bottom right). The images are displayed with a logarithmic stretch between 0.1 and 1.0 MJy sr⁻¹, and the contours are equally spaced in log space between 0.3 and 30.0 MJy sr⁻¹.