Spectrum Averaged Raman spectrum of Allende pellet n°1 irradiated ($He^+$, fluence $5~10^{14}$ ions.$cm^{-2}$) Spectrum Averaged Raman spectrum of Allende pellet n°2 irradiated ($He^+$, fluence $2~10^{15}$ ions.$cm^{-2}$) Spectrum Averaged Raman spectrum of Allende pellet n°1 irradiated ($He^+$, fluence $1~10^{16}$ ions.$cm^{-2}$) Spectrum Averaged Raman spectrum of Allende pellet n°2 irradiated ($He^+$, fluence $3~10^{16}$ ions.$cm^{-2}$)