Besides the Gaussian, Lorentzian, and BWF functions mentioned above, Voigt, pseudo-Voigt and split-Lorentzian functions are used too. And we also have q-Gaussians and split-q-Gaussians for fitting Raman spectra. In both cases, areas, and positions of the peaks of Raman spectra decompositions are depending on the considered line shapes. To show that the decomposition changes according to used functions, let us the consider the data from Sardinha, given in the Fig. , and the Fityk software . Fityk is a curve fitting and data analysis application, free and open source. It can perform a Levenberg-Marquardt algorithm, among other best fit algorithms. The function of merit is the weighted sum of squared residuals (WSSR), also called chi square. Fityk has several built-in functions but allows to execute a script with user-defined functions(see in the Appendix how we can define in Fityk q-Gaussian and split-q-Gaussian functions).