Results of Gaussian Mixture models for: the recent data used for this study (left column), the data set of Richardson et al. (2014) (middle column), and all data (combining both) (right column). The top row shows the BIC and AIC for models of N components, and the red dotted vertical line denotes the N that minimises BIC. The middle row shows the GMM results for N = 2 and the bottom row shows the results for N = 3.