English: These plots show four probability density functions (PDFs) from the Dirichlet distribution over the 2-simplex where the concentration parameters α are varied. The values of α are set to (1.5, 1.5, 1.5), (5, 5, 5), (1, 2, 2), and (2, 4, 8). The values of the PDF are shown by the color maps with contour lines at equal values as indicated in the color bars.