Fig. : Best fit (green) onto RRUFF ID R040036 Raman spectrum (red). Two q-Gaussians to generalize the pseudo-Voigt functions are used (the values of the q-parameters are given in the figure). The fitting calculation is obtained by minimizing the sum of the squares of the deviations (sum from n=200 to n=450 equal to 6.9 x 10 -4 ). The misfit band is 0.01 large.