psd_ternary_plot: Displays all the samples on a ternary plot
In benmarwick/au13uwgeoarchlab: Analysing and visualising geoarchaeology data

Shows the sand-silt-clay percentages on a triangular graph

1	psd_ternary_plot(my_data, cex = 0.75, col = "blue", ...)

`my_data`	the data resulting from the `get_data` function
`cex`	number indicating the amount by which plotting text should be scaled relative to the default. Default here is 0.75.
`col`	colour to plot the samples. Default is blue. For other possible colour, type `colours()` at the console.