GLEAM images of G5.9+3.1. Top two panels: wideband image taken over 170–231 MHz. Lower two panels: an RGB image comprised of R = 72–103 MHz, G = 103–134 MHz, B = 139–170 MHz. The full width at half maximums (FWHMs) of the point spread functions (PSFs) of the images are, respectively: 2.4′, 5.2′, 3.9′, and 2.9′. Left panels: images without any annotations. Right panels: annotations indicating the GLEAM photometry measurement; the white lines show the region drawn by the observer that contains the SNR; the gray shaded region shows the area used to calculate the background; the blue dashed lines show a region excluded from the background measurement for containing contaminating background radio galaxies.