In discussing the spectroscopy of carbonaceous materials, in particular G and G' bands, Merlen and coworkers tell the following. For "One band: The G band is fitted by a Lorentzian if symmetric, and by a BWF if not symmetric". We have discussed G and G' bands of graphite in ChemRxiv2 and we used q-Gaussians. We used q-Gaussians too for other carbonaceous materials (biochar and nanotubes) in SSRN. The behavior of the peaks we considered is q-Gaussian, that is, not Lorentzian or Gaussian but q-Gaussian. For what is regarding the BWF asymmetric line shape, we started investigation about the Raman LO mode band in Silicon Carbide.