Plots are unreadable.

[tower120]

On Windows, generated plots at 100% zoom have virtually unreadable axis marks and ticks.
Here is what I see (click on to see at 100%):

[sandersaares]

This is because of the fallback renderer on Windows when gnuplot is not installed. Unfortunately, the currently latest release on crates.io still has a bug (fixed in master) that causes gnuplot usage on Windows to fail. Should get better after #836, assuming you have gnuplot installed.

[tower120]

... assuming you have gnuplot installed.

I assume most end-user will not have gnuplot installed on Windows. I don't even understand what that mean in Rust context.