Peak type III radio fluxes. Left: histogram of the NRH peak fluxes at the four selected frequencies. Right: distribution of the NRH peak flux as a function of frequency. The size of the box indicates the interquartile range (IQR) – the range of the 25th percentile to the 75th percentile. The red dots denote the median. A straight-line fit in the log-log space was carried out to the median as shown by the red dashed line. The green triangles are the mean values which are more affected by outliers.