Properties of nonthermal emission across Vela Jr. The top panels illustrate the distribution of the photon index Γ (left) and the surface brightness Σ_Γ (right), that is, the integrated flux per surface area of the nonthermal model components in spectral fits to Voronoi bins. The energy range for the computation of the integrated nonthermal flux is 1.0–5.0 keV. The bottom panels illustrate the corresponding 1σ uncertainties of photon index (left) and surface brightness (right) measurements in each bin. The gray circle gives the extent of Vela Jr, and is identical to the circle displayed in Fig. 2. The position of the CCO and the energetic pulsar PSR J0855–4644, located in the southeast region of Vela Jr, are respectively indicated with a gray and green plus sign (+).