Residuals of the fit data after subtracting all non-AME components. Top panel: residuals relative to a normalized log-Gaussian distribution. A transparency gradient was applied to deemphasize points with large error bars and enhance visual clarity. The lower sub-panel shows the binned weighted mean residuals as percentages relative to the standardized model, with bins evenly spaced in logarithmic scale. Bottom panel: total fit AME flux densities (orange) in a linear y-scale compared with the sum of best-fit log-Gaussian components (black). The sum only includes the 85 sources with simultaneous QUIJOTE and C-BASS coverage. A single log-Gaussian distribution fit to the AME residuals is shown as a dashed red line, with ν_AME = 22.8 GHz, W_AME = 0.62 and χ_r² = 3.1.