Returning to the measurements made by Gavilan et al., 2022, the researchers observed that in the case of pyrene-derived nanograins, that is, nanograins generated from gaseous pyrene, the spectrum shows a broad graphitic G band at 1587 cm -1 and multiple disorder D bands, with the largest peak at 1388 cm -1 . According to Gavilan and coworkers, the bands are attributed to defects in the carbonaceous structure. The researchers produced the nanograins in the COSmIC (Cosmic Simulation Chamber) facility at NASA Ames Research Center. The chamber is preparing solid carbonaceous samples from the gas phase pyrene. In the Figure provided by Gavilan and coworkers we can see the baselinecorrected Raman spectrum of COSmIC nanograins. The Raman spectrum is decomposed by Gavilan and coworkers, using Lorentzian and Gaussian profiles; the decomposition is "revealing the presence of a G band and multiple D bands". In the Fig. we propose a sketch of the pyrene-generated nanograins spectrum.