Stellar population in the DEM L299 region. Shown are OB-stars (dashed yellow small circles), clusters and associations of stars (white circles). The position of the remnant and of the superbubble are marked with a black and a dashed white circles. The images show the region in the broadband (0.3–8 keV) X-ray (left) and in the Hα light (right). To create the images, the same parameters as in Figs. 2, left side, and 3, left side, have been used. Scales of the left image are in units of counts/s/deg², while the scales on the right side are in 10^-15 erg/cm²/s. The population study has been performed with SIMBAD.