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Fig. 4

Distribution of 1.4 GHz to 2.3 GHz spectral indices in the final catalogue for all sourceswith unambiguously detected 2.3 GHz counterpart and both the 1.4 GHz and 2.3 GHz flux densities exceeding 0.3 mJy. AGN classifications of the sources are from Mao et al. (2012).
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