Fig. 5.
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Distribution of brightness temperatures in the LoTSS-Deep-HD detected sources. The solid, dashed, and dotted blue lines indicate the maximum brightness temperature from starbursts for a synchrotron spectral index α of −0.7, −0.8, and −0.9, respectively, as per Condon et al. (1991). Values to the right of this line cannot be driven by pure star formation.
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