Left: 20 cm radio-continuum image of DEM L299 with overlaid Hα contours, showing the same area of as the X-ray images in Fig. 2. The image was smoothed with a Gaussian using a kernel radius of one pixel. The contours are taken from the Hα image in Fig. 3 with one contour level at 2. The dashed black circle indicates the position of the SNR, while the dashed white circle shows the position of the superbubble. The scales are in Jy/beam. Right: same as left, but for the 36 cm radio-continuum data and with the same X-ray contours as in Fig. 3.