Comparison of the 21 cm LSS power spectrum at z = 0.6 with f_HI ≃ 1.3% (red, orange) with the radio foreground power spectrum. The radio sky power spectrum is shown for the GSM (Model-I) sky model (dark blue), as well as for our simple model based on Haslam+NVSS (Model-II, black). The curves with circle markers show the power spectrum as observed by a perfect instrument with a 25 arcmin (FWHM) Gaussian beam.