Average number of sources per square degree as a function of flux density, plotted over a relevant flux range. The y-axis is scaled with an extra flux density factor S to have equal counts in logarithmic bins come out at equal height. Above 100 mJy, the source counts of TGSS (blue dots, with Poissonian error bars smaller than the dot size) closely follow the model 151 MHz source counts derived from the SKADS simulation by Wilman et al. (2008; black line). Below 100 mJy, the TGSS number counts increasingly deviate from the SKADS number counts due to incompleteness of the TGSS catalog. The false counts (red dots) are several orders of magnitude smaller than the source counts.