PCA graph of factors 1 and 2 for values of Bam Fe, Zr, and MN (log[10]) without outliers, all polished categories.
Isbell, William H.; Uribe, Mauricio I.; Tiballi, Anne; Edward P. Zegarra, 2018, "Visual database", https://doi.org/10.25346/S6/1B33FN.