Pixel-wise relative uncertainty map of fast-resolve S-band reconstruction compared to the resolve uncertainty map of Arras et al. (2021a). The relative uncertainty is lower for both reconstructions in regions of high surface brightness. In the hotspot, the relative uncertainty is around 10⁻³−10⁻² and increases toward the lower surface brightness regions. Outside of Cygnus A, the relative uncertainty fluctuates around 1, indicating that the reconstructed intensity is statistically consistent with zero surface brightness. The estimated uncertainty of resolve tends to be slightly higher than the uncertainty estimate of fast-resolve. This might be due to the resolve reconstruction of Arras et al. (2021a) not being fully converged.