Comparison of the disentangled spectra (blue) of the Aa1, Aa2, and Ab components with the best-fit synthetic spectra (orange) found by PYTERPOL. The range from 428 to 449 nm was used for disentangling. The flux is normalised to the local continuum. The small panels show the residuals (red). The relative luminosities of the Aa1 and Ab components significantly exceed that of the Aa2 component (see also Table 7).