Fig. : Deconvolution with q-Gaussian functions of the Hematite peak at 295 cm -1 to evidence its shoulder. The best fit (green) is onto processed data (red) provided by El Mendili et al., 2012 (see Fig. ). For the deconvolution, five q-Gaussians have been used. For the peak and its shoulder, the values of the q-parameters are given in the figure. On the right, the same fit is shown with the log scale for y-axis (semi log scale). The fitting calculation is obtained by minimizing the sum of the squares of the deviations.