XMM-Newton-EPIC count-rate map showing a close-up view of the southwestern limb of SN 1006 in the 1–7 keV band. Top-left panel: bin size of 4″. The red and green circles indicate the regions adopted to extract the NuSTAR and XMM-Newton spectra of knot1. The field of view corresponds to the magenta box in the right panel of Fig. 2. Top-right panel: same as the upper left panel in the 6.12 − 6.96 keV band, with bin size 8″. Lower-left panel: flux image of the same area in the 1–7 keV band (bin size 2″). Lower-right panel: IR emission of the same region, as observed with Spitzer at 24 μm.