Top: estimate of the value of φ_D (Eq. (6)) for each LFI radiometer during the whole mission. The plot shows the median value of φ_D over all the samples and the 25th and 75th percentiles (upper and lower bar). These bars provide an idea of the range of variability of the quantity during the mission; they are not an error estimate of the quantity itself. Bottom: estimate of the value of φ_sky (Eq. (8)). The points and bars have the same meaning as in the plot above. Because of the low value for the 44 and 70 GHz channels, the inset shows a zoom of their median values. The large bars for the 30 GHz channels are motivated by the coupling between the stronger foregrounds and the relatively large power falling in the sidelobes.