[R] Query on contour plots

Abby Spurdle @purd|e@@ @end|ng |rom gm@||@com
Wed Jun 3 02:53:28 CEST 2020

>  that extraneous white lines in PDFs are the fault of the PDF
> viewing program rather than of R.

Except it's a PNG file.

I've tried to minimize artifacts viewing PDF files.
But assumed (falsely?) that PNGs and other raster formats, would be fine.

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