Fig. 5
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Spectrum of the diffuse emission from ρ Oph W, as estimated with the cross-correlation slope, aν. The black line is the best-fit powerlaw spectrum, with spectral index indicated in the legends. Plots a-c correspond to spectra extracted over different parts of the mosaic, as indicated in each plot. Field IDs follow from Fig. 1. Spectral windows are plotted in alternating colours.
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