Sky distribution of the minimum foreground emission at ℓ = 80 expressed in units of the cosmological tensor-to-scalar ratio, r_FG, from S-PASS and Planck-353 data. Larger and smaller maps show the mean estimated value for r_FG and the 1σ lower and upper limit, and , respectively; the white spots close to the southern Galactic pole for represent locations where the latter is negative. Lower panels: histograms of the corresponding maps.