Intensity-scaled X-ray image of DEM L299 in an energy range of 1.5–4.5 keV. The dashed black circle indicates the position and size of the SNR as indicated through the [S ii]/Hα flux ratio image (Fig. 4), and the dashed white circle the superbubble as indicated through the optical images (Fig. 3). Most of the hard X-ray emission is confined inside the SNR region. Area of the sky, scale units, and smoothing parameters are the same as in Fig. 2.