This tutorial will show you how to create a Ternary Contour graph and to overlay a scatter plot.
Minimum Origin Version Required: 2020
This tutorial is associated with <Origin EXE Folder>\Samples\Tutorial Data.opj.
Also, you can refer to this graph in Learning Center. (Select Help: Learning Center menu or press F11 key , and then search the keyword "Ternary Contour".)