Github user echarles commented on the issue:
https://github.com/apache/zeppelin/pull/2730
`fig.retina` sounds like a good property to play with. However, fixing
`out.width` to an arbitrary value may give good result for the example you
give, but did you try with other plots?
Showing nice-looking plots generated by knitr depends on your screen
resolution and browser actual window width.
We had before (I hope it is still there) the ability to force the image
width passing a json after the magic keyword
```
%spark.r {"imageWidth": "400px"}
```
If you use that `imageWidth` property and push a bit more `fig.retina` to 3
or 4, could it be that most cases will be covered?
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