How to put lines and asterisks of statistical significance (0.05) above the boxplots?

signif. codes: 0.001=*** , 0.01=** , 0.05=* , 0.1= .

Do you know what command I can use to add those lines and asteristics to my boxplot ?, the image is an example.

Thank you in advance

I think you want the ggsignif package.


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