Figure 2. Displacement cross sections of ¹²C and ¹³C measured at different acceleration voltages.

The STEM data is marked with squares, and earlier HRTEM data¹¹ with circles. The error bars correspond to the 95% confidence intervals of the Poisson means (STEM data) or to previously reported estimates of statistical variation (HRTEM data¹¹). The solid curves are derived from our theoretical model with an error-weighted least-squares best-fit displacement threshold energy of 21.14 eV. The shaded areas correspond to the same model using the lowest DFT threshold T_d∈[21.25, 21.375] eV. The inset is a closer view of the low cross section region.