Logratio plots
Besides ternary diagrams, logratio plots are a second way to visualise
(U-Th)/He data on a two-dimensional surface. They plot log(Th/He) vs.
log(U/He). The default scale goes from -1 to 6 on both axis, but can be
automatically set to display the sample data at optimal resolution
by clicking Options → Settings, or to any other values.
See Ternary Diagrams,
Scale