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Fig. 3

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Spectral index () versus 1.4 GHz flux density plot. Plus (+) and cross (×) symbols represent USS sources in the B03 and in the S06 fields, respectively. The dashed line represents the median spectral index value () for the full sample. The flux density limits at 325 MHz and 1.4 GHz are represented by dotted and long-dashed lines, respectively.

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