Top: same microwave dust SED as in Fig. 15 with the spectral fit for model 2 in Table 4. The spectral index of the greybody is fixed to the value β_FIR = 1.65 inferred from the fit of the dust SED at ν ≥ 353 GHz (Table 3). The AME is fitted with the analytical model in Eq. (10). This fit includes a third component represented by a blackbody spectrum at the same temperature (19.8 K) as that of the greybody. Bottom: blackbody component in model 2 as a fractional residual after subtraction of the AME and greybody emission from the total, compared to the data residuals.