Literature tells us that wavenumbers of some A1 and E modes are very close, and therefore the observed modes are mixed. For instance, the peak at 515 in the Fig. , is given as E(TO), A1(TO). In the Figure , we used one q-BWF function for this component. Let us try to decompose it in two different components; we find the following result (on the right, Fig. ), compared to the case with one component (on the left, Fig. ). Note that the misfit (lower part of images) is strongly reduced. The two components have the peaks at 514 and 526 cm -1 , respectively. The fit of the dip, that in the Figure is assigned to E(LO), A1(LO), E(TO) is improved too.