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Fig. 9.
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Distribution of the spectral indices obtained with a linear fit to the LOFAR, FIRST, and VLASS data to the sources of the faint sample, that is, with P500 ≳ 1027 W Hz−1. The gray bar represents the 21 sources that were not detected by in the high-frequency surveys. The vertical dashed green line separates FSRQs from SSRQs.
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