Fig. 5
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Fit of the radio spectrum of our primary in-field calibrator using data from WENSS at 330 MHz, the GMRT at 610 MHz, NVSS at 1.4 GHz, LoTSS DR2 at 144 MHz, the 6C and 7C surveys at 151 MHz, and the LoLSS image at 54 MHz constructed by us. We added the green downward triangle from the VLSSr flux density limit to illustrate the accuracy of the spectrum at lower frequencies.
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