Euclidean normalized radio number counts at different frequencies scaled from 1.4 GHz with a simple power-law radio SED (see text for details). The dashed line marks the S_{1.4 GHz} = 10 μJy cut, below which SF galaxies highly dominate the number counts. The filled symbols represent the 5σ sensitivity limits for proposed multi-tiered (ultra-deep, deep, and wide) future radio surveys.