100 deg² of the region surrounding the Hoinga SNR as seen at 408 MHz by the survey by Haslam et al. (1982), after conversion from K to Jy beam⁻¹. Left panel: original image, and right panel: image after source-subtraction and backgrounding, discussed in Sect. 3.2. Hoinga is visible as an ellipse in the centre of the image, while Galactic cirrus and scan line artefacts from the Parkes observing strategy dominate the surroundings. The bright source in the northwest is Hydra A, and subtraction of this source has not been performed.