Depths and frequencies of radio surveys in the literature targeting the ELAIS-N1 field. The area of each circle is proportional to the area covered by the survey. The area of the inner dot is proportional to the resolution with smaller dots indicating better resolutions (ranging from 4.5 arcsecs up to 100 arcsecs). The data were not found to be publicly available for the observations outlined with a dashed line (those of Taylor et al. 2007; Taylor & Jagannathan 2016; Ocran et al. 2020). The solid line indicates a spectral index of 0.8 and the dashed line one of 0.7.