XMM-Newton background-subtracted flux images combining MOS and PN cameras in units of ph/cm²/s/arcmin². Left: low-energy band image (0.5–0.8 keV) adaptively smoothed to a signal-to-noise ratio of 10 using the task asmooth provided in the XMM-Newton software SAS. The position of PSR J0855 − 4644 is shown with a red circle. Right: image in the high-energy band (1.2–6 keV) smoothed with a Gaussian width of 7′′. The dashed red line shows approximately the SNR shell RX J0852.0−4622. In solid line we show the spectral extraction regions used to study the rim of RX J0852.0−4622 and the PWN whereas the dashed line regions are used to estimate the spectrum of the astrophysical background.