Tomographic images for SNR G15.4+0.1 constructed from data at 330 and 624 MHz. The data at both frequencies were matched to the same uv-coverage. The radio spectral index αt is indicated at the top right corner of the panels. The grey colour bar in the middle column represents the scale of the residuals components, which is the same for all tomographies. In the greyscale representation, spectral components for which α is steeper than the assumed αt are shown as light regions (positive residuals), while flatter components are seen as dark features (negative residuals). A contour delineating the radio continuum emission at 330 MHz is included for reference. The total intensity image of G15.4+0.1 at 330 MHz is plotted in the bottom right frame (Brogan et al. 2006).
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