Grapher cannot directly create a Piper plot. However, through a small workaround, Grapher is capable of producing these plots.
A sample piper plot created in Grapher.
A sample plot and data file are attached. A second sample filie uses colored symbols as labels is also attached. In addition, a sample is contained in the Samples directory for Grapher 12.
Both data files displays ID, cations, anions, and two combined columns. The anions in columns E, F, and G (highlighted in blue below) should be normalized to add up to 100%. The cations in column B, C, and D (highlighted in red below) should be normalized to add up to 100%. After the columns are normalized the worksheet can be used to create the piper plot. Columns I and J (highlighted in green below) use a formula to create combined data. The piper for grapher colors.xlsx file contains color names and a symbol in column K. Columns L and M are used to label the cation bottom left ternary diagram.
Verify that the cations and anions add to 100 before creating the piper plot.
If you would like a more direct way to create a piper diagram in Grapher, please let us know.
Updated July 7, 2016