Angular power spectrum (C_ℓ) with 1σ error bars (in red and purple) plotted as a function of angular multipole (ℓ) for the visibility-based estimator (TGE; S. Choudhuri et al. 2014) at frequency 325 MHz for six target pointings at different latitudes of the GAMA-23 field. The vertical gray shadow indicates the range of ℓ values used to fit the power law, and the best-fitting model C_ℓ = A(1000/ℓ)^β is shown in magenta. The dashed dotted line (in green) represents the fitting prediction (i.e., S_min = 5σ; S. S. Ali et al. 2008). The values of magnitude A, power-law index β and ℓ range for APS are given in Table 5 for Band-3.