Fig. : Processed data of RRUFF ID 060277 depolarized. On the right, the data with log scale y-axis (semi log scale). The semi log scale helps us to identify five ranges, named A, B, C, D and E, suitable to investigate the q-Gaussian fitting. The endpoints of frequency ranges are easily determined by their lowest intensities, evidenced by the semi log scale. Fig. The best fit (green) onto RRUFF ID R060277 depolarized Raman spectrum (red), range A (see Fig. ). Three q-Gaussians are used (values of the q-parameters are given in the figure). The misfit is proposed in the lower part of the plot. On the right, the same fit is shown with the log scale for y-axis (semi log scale). Data and q-Gaussians are given as functions of integers n (equally spaced points used in fitting), for the x-axis which is representing the Raman shift. A convenient scale is used for the y-axis (intensity axis). The fitting calculation is obtained by minimizing the sum of the squares of the deviations (sum from n=1 to n=620). In the semi log plot, on the right, we can see very well the mode at 198 cm -1 . Fig. : The same as in the Fig. , for RRUFF ID R060277 depolarized Raman spectrum (red), range B. The fitting calculation is obtained by minimizing the sum of the squares of the deviations (sum from n=1 to n=620). In the semi log plot, we can see very well the band at 317 cm -1 . The value of this sum is about 9.0 x 10 -3 . For fitting, here we used only one q-Gaussian. The plot is evidencing the asymmetry of the band. , in a fit with two components. The value of the sum of the squares of the deviations (sum from n=1 to n=448) is 4.7 x 10 -4 . We will further discuss the decomposition of this range. Let us anticipate that the fit here proposed has been obtained just guessing two components, without any further information (unconstrained guess). However, some constrains exist. From the figures given above, we can note a very good agreement. The five ranges have been fitted independently from each other (see Appendix A). In the case of the range C (Figure ), we can see an asymmetric peak. We have resolved it into two bands. The same happens for the polarized component (see Appendix B). In any case, the range C is requiring a further discussion. . "The Raman band at 144 cm -1 is very intense and sharp. The frequency of this band in anatase, 144 cm -1 , is nearly equal to that of the B1g mode in rutile (143 cm -1 ) which is sharp but weak" . "At room temperature the αxx spectrum exhibits two peaks at 516 and 399 cm -1 besides the Eg mode at 144 cm -1 and three weak combination bands near 796, 695 and 320 cm -1 ." .