[R] Extracting arrows from CCA plots

[kirchman]

Here's a partial answer to my own question. While I still don't know how to
get the arrow information out of a CCA plot, it is possible to reproduce the
arrows by first extracting the biplot data with scores (results.cca,
display="bp") and then using the ordiArrowMul function in vegan to rescale
the data as desired for the plot. 



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