eRASS:4 smoothed image of G321.3–3.9 in the 0.5–2.4 keV energy range with regions used for the eROSITA X-ray spectral analysis. The main source region is the solid yellow polygon surrounding the SNR. The point sources subtracted from the field are highlighted by a green circle with a red line in the center. The background region is the area between that polygon and the bigger dotted polygon.