Table 4: Median and dispersion of the log-normal distribution for the fractional polarization, , as a function of frequency and for the different radio source populations relevant at CMB frequencies. Two cases are considered, a more “optimistic” one and a more “conservative” one (see Section 5.1).

GHz GHz
Steep FSRQ BL Lac Steep FSRQ BL Lac

Lower case (more “optimistic”)

(%) 3.0 2.0 2.5 4.0 2.5 3.0
(%) 5.0 3.0 3.5 6.0 3.5 4.2

Upper case (more “conservative”)

(%) 4.0 3.0 3.6 5.0 3.6 4.3
(%) 6.0 3.8 4.5 7.0 4.6 5.5