Figure 5. Linear regression of ERR slopes as a function of the first phylogenetic principal components (pPC1).Each point represents a species-rich plant family (n=49), with size of point representative ofMalesian richness . Two families labeled as examples for comparisons between plots: 1) Dipterocarpaceae and 2) Ericaceae. Negative pPC1 scores represent stronger Sundaland endemism(represented by magenta tones) or overlap , as well as higherrichness ratio , which is proportion of Malesian richness concentrated within a single 100 m elevational band. Positive pPC1 scores represent Sahul endemism (cyan tones) or greater montane affiliation based on lower or upper average elevational limits for occurrence, peak in richness at higher elevations, or broader familial elevational extent of occurrence. Results using linear regression with slope shown in black, phylogenetic independent contrasts slope in red.