Fractional uncertainties expected for the angular power spectrum for the BINGO experiment (f_sky = 0.07) for redshifts z = 0.127 (solid lines) and z = 0.449 (dashed lines) after 1 year of sky integration. The ratio is plotted between different sources of uncertainty (cosmic variance, shot noise, and thermal noise) and the H I angular power spectrum, , as a function of multipole. For the cosmic variance the standard formula, , is used, and for the thermal and shot noise ΔC_ℓ is equal to their angular power spectrum multiplied by the cosmic variance factor.