As mentioned above and seen in the trends of peak frequencies with electron dose (Fig. ), the inflection points suggest competing strain and doping effects in the graphene. These effects can be deconvoluted by plotting the G and 2D peak frequencies in a strain-doping (𝜀-𝑛) plot. The G and 2D peaks have different dependencies on strain (e) and doping (carrier concentration, 𝑛):