Fig. 3: Results from the statistical analysis of NAA data on ochre sources.

Scatterplot of principal component 1 (PC1 60.1%) vs principal component 2 (PC2 8.4%). The distribution of source materials from Ngwenya (high grade, HG or low grade LG), Bulembu, Maloma, and Mnyogane (including Luphohlo Dam), are shown. Ellipses are drawn at 90% confidence. Source data are available in Supplementary Data 3.