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Fig. 2

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Histogram of 325 MHz to 1.4 GHz spectral index (). Green solid line histogram represents sources in the B03 field while red dashed line histogram represents sources in the S06 field. Median spectral indices in the B03 field () and in the S06 field () are represented by vertical green dashed-dotted and red dashed lines, respectively. USS limit () is represented by the vertical dotted line.

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