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Once your ggplot2 chart is done, you often need to annotate it to provide more information or highlight a specific part. This is done using the annotate() function.

In this first example, we add 2 text elements on the plot. Please note that to add text from a data.frame, you need to use geom_text!

 

Now, here are 3 examples showing how to add rectangles, segments and arrows to your plot. The code is quite straightforward:

 

 

 

If you need to add ablines, do not use annotate! The geom_hline and geom_vline have been created for that!

 

 

Last, you can add a point and a range around it with the “pointrange” geom:

 


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