Extended Data Fig. 7: Phonon models and model fitting algorithm.
From: Enhanced inner core fine-scale heterogeneity towards Earth’s centre
a, A demonstration of the model fit using the algorithm in Eq. 4. The grey line is the observed ICS envelope. The red line is the best-fitting model prediction, and the blue line is a model prediction mismatching the observation by a factor of 4. b, All inner core heterogeneity models in this study. Green lines are the Class 1 models with uniform diffusivities. Red lines are the Class 2 models with stronger scattering strength in deep inner core. Blue lines are Class 3 models with weaker scattering with depth. The grey line is the same observation as in a. The brown line is the best-fit model.
