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Fig. 9.


LoTSS-DR1 to TGSS-ADR1 integrated flux density ratio as a function of integrated flux density (left panel) and for sources with a integrated flux density higher than 100 mJy as a function of distance from the nearest LoTSS pointing centre (right panel). Below 100 mJy the completeness of TGSS-ADR1 drops below 90% and, as a consequence, there is significant scatter in the integrated flux density ratio for sources below this limit. In the right panel we show that the 835 compact sources above this integrated flux density limit have a median integrated flux density ratio of 0.94 and a standard deviation of 0.14 (blue points) and a median peak brightness ratio of 0.83 and a standard deviation of 0.13 (red points). The thicker symbols show the median within bins indicated by horizontal error bars and the vertical error bars show the 95% confidence interval of the derived median value estimated by the bootstrap method. The bins are chosen to contain equal numbers of sources, which is 500 and 170 for the left and right panels respectively. The vertical dashed line shows the median distance between LoTSS pointings and many of the measurements at greater distance are due to the edges in the LoTSS-DR1 mosaic.

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