Maps of the normalisation, divided by the surface of each region, of the four Gaussians added to the model: G1 at 1.24 keV, G2 at 0.72 keV, G3 at 0.654 keV and G4 at 0.57 keV. The scales are not the same. While G1, G2 and G4 seem correlated with the IME and iron components, the spatial distribution of G3 is very different and is likely associated with O VIII. This would represent the first detection and mapping of oxygen emission in Tycho’s SNR.