Spectral index vs. S2.1 GHz for SUMSS sources cross-matched to one or more ATCA XXL-S sources. The red line representsthe lower limit to the spectral indices for matched ATCA sources with a given S2.1 GHz. It clearly demonstrates that sources with flatter spectral indices are missed at the faintest flux density levels (S2.1GHz ≲ 3 mJy).
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