0.3−2 keV band false-color images (smoothed) of galaxies in our sample. Dashed white regions correspond to D₂₅. Green lines show regions used for source detection having exposure map values greater than 20% of maximal value (for more detail see Sect. 3.1). Stellar masses listed in Table 2 are computed for these regions. The inside areas of small green regions near the center of Centaurus A, M 83 and M 51 were excluded from analysis.