Comparison between SUMSS 843 MHz and ATCA-XXL 2.1 GHz fluxes for the XXL-S Pilot area based on 159 sources detected in the shallower (rms ~1.25 mJy/beam) SUMSS survey. The inset shows the spectral index distribution for the sources with a mean of − 0.78 and a standard deviation of 0.28. The solid line corresponds to a spectral index of − 0.78.
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