Recovered power spectrum of the 21 cm LSS temperature fluctuations, separated from the continuum radio emissions at z ~ 0.6, f_HI ≃ 1.3%, for the instrument configuration (a), 11 × 11 packed array interferometer. Left: GSM/Model-I, right: Haslam+NVSS/Model-II. The black curve shows the residual after foreground subtraction, corresponding to the 21 cm signal, WITHOUT applying the beam correction. The red curve shows the recovered 21 cm signal power spectrum, for P2 type fit of the frequency dependence of the radio continuum, and violet curve is the P1 fit (see text). The orange curve shows the original 21 cm signal power spectrum, smoothed with a perfect, frequency-independent Gaussian beam.