Fig. 7.
Local rms noise per HEALPIX cell, calculated via the mean of the local rms around each LoTSS-DR1 radio source. The heat map (top) and histogram (bottom) of the local rms is clipped at an upper limit of five times the median rms noise. The median rms noise of 0.07 mJy beam−1, as well as the values of two and three times the median rms noise are marked in the histogram with black dashed lines.
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