Left: radio map of the G304.4−0.2 region at 1.384 GHz. Middle: radio map of the G304.4−0.2 region at 4.85 GHz obtained in the PMN survey (Condon et al. 1993). The blue ellipse shows the extension of the PMN survey source PMN J1303−6259 as presented in the catalogue (Wright et al. 1994). The resolution of this map is ~ 5′ (Condon et al. 1993). Right: radio map of the G304.4−0.2 region at 843 MHz obtained in the MGPS-2 survey (Murphy et al. 2007). The size of the beam is ~ 45′′ × 50′′. The black circle in all the panels indicates the extension of the shell-like structure and the black cross shows its centre. Middle and right images were obtained using the NASA SkyView online tool (http://skyview.gsfc.nasa.gov).