This tutorial will show you how to create a Ternary Contour graph and to overlay a scatter plot.
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 open Graph Sample: Contour)
In order to show all three panels in Plot Setup dialog, please expand Plot Type panel by clicking and expand Available Data panel by clicking again.
Please refer to Plotting using Plot Setup for more information.