[R] Query on contour plots

Abby Spurdle @purd|e@@ @end|ng |rom gm@||@com
Tue Jun 2 20:44:03 CEST 2020

> Very nice

Jim, thank you.
However, the (deterministic, or near-deterministic) diagonal lines in
the plot, make me question the suitability of this approach.
In my plot, the contour lines could be removed, and brighter colors
could be used.

But perhaps, a better approach would be to model those lines...
And it's not clear from the plot, if all the observations fall on a
diagonal line...

I'm not sure why there's a white line on the plot.
Most of my testing was with PDF output, I will need to do some more
testing with PNG output.

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