Images of the spatial structure of the main line emission in Cassiopeia A as retrieved by an interpolation method (left column), and from application of GMCA around the respective line emission region (middle and right columns). In all cases, the GMCA algorithm decomposes the line emission into two images, corresponding to spectra that are slightly redshifted or slightly blueshifted with respect to the rest-frame line position. The energy ranges used for GMCA are shown in Fig. 8. The energy ranges used for the interpolation method are respectively: 1.7–2 keV, 2.25–2.6 keV, 3–3.35 keV, 3.7–4.1 keV and 6.2–7.1 keV.
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