Angular power spectrum residuals of different TGSS samples with respect to the Reference case, expressed in units of Gaussian errors. Upper panel: normalized residuals of the TGSS samples selected at different values of the minimum flux cut, , indicated in the plot, compared to the Reference case of . Middle panel: we consider samples selected at different values of the maximum flux cut, ; the Reference is . Bottom panel: residuals for samples with different geometry masks, cut at different values of the Galactic latitude, also indicated in the plot, referred to the baseline case of |b|> 10°. The dotted horizontal lines in all panels indicate the 1σ Gaussian error of the Reference sample. The dashed horizontal line indicates the zero residual level.