Median flux densities of all matched sources for 8C, LoLSS, LoTSS, and NVSS (61 sources; top line), LoLSS, VLSSr, LoTSS, and NVSS (130 sources; mid line) and LoLSS, LoTSS, and NVSS (4 895 sources; bottom line). In red are the LoLSS in-band flux densities. The height of the lines shows the uncertainty on the median. Black dotted lines are linear polynomials derived from NVSS and LoTSS values in all cases. Yellow line is the quadratic polynomial derived from 8C/VLSSr, LoTSS, and NVSS.