From the Figure , we can see that the band between 1700 and 2800 cm -1 is made of functions which are not Gaussians, besides being asymmetric. Let us compare the decompositions of this band in the case that, for the decomposition of the total spectrum, q-BWF functions or Gaussians are used. The comparison is proposed in the Fig. . As in the case of the Figure , let us consider the parameters of the two central bands. The result is given in the following Figure .