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How can I make the ZERO gridline bold?

Bold Gridline

Ben Bolker
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ramgouveia
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  • [See here](https://stackoverflow.com/q/5963269/5325862) on making a reproducible example that is easier for folks to help with, including sample data and code. You said a bold gridline, but then show a box around that line; what exactly are you trying to get? This is why an attempt at code is helpful – camille May 13 '21 at 14:28
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    If you just want one line to be bold, I recommend just using `geom_hline` or `geom_vline` and plot them before any other `geom_*` function. – Justin Landis May 13 '21 at 14:35

2 Answers2

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I'm not certain about what you want without a reproducible example, but an easy solution could be by simply using geom_hline(yintercept=0, color = "grey", size=2). Of course you can change the color or size.

Ben Bolker
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Kim
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As @JustinLandis says, something like

geom_hline(yintercept=0,lwd=3) 

should work (adjust the value of lwd to your liking; you can also specify this as size). Since ggplot plots in order, put this specification before your geom_line() and other stuff.

Ben Bolker
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