Recently, we considered how the Raman spectra of graphene and graphene oxide appear when compared to graphite. In the review we mentioned the Breit-Wigner-Fano (BWF) line shape, that , told suitable to represent the G band of carbonaceous materials. BWF is a modified Lorentzian function used to consider asymmetry and Fano resonance (see please , about Fano theory and model). For instance, Hasdeo et al., 2014, used the "Breit-Wigner-Fano line shapes in Raman spectra of graphene", because of the "interference effect between the phonon spectra and the electron-hole pair excitation spectra" . Let us stress that asymmetry can be obtained also by using a split-Lorentzian function for instance. What is characterizing the BWF function is the presence of a "shape resonance", as shown in the Fig. by , or, as given elsewhere , of the "dip" of antiresonance.