Comparison of the 5σ detection limits of a number of radio continuum surveys and the Apertif surveys. The lines indicate a spectral index α = −0.8, which is typical of extragalactic radio sources. The noise for the EMU survey was taken from Norris (2017). The two LOFAR HBA points refer to LoTSS (Shimwell et al. 2019) and to the LOFAR deep fields (Tasse et al. 2021). The latter cover limited areas (of a few tens of square degrees). The MIGHTEE survey, although very deep, only covers a limited number of square degrees.