[R] Showing which bars in a bar chart are significantly different

[omernevo]

Hello,

a probably rather stupid question to which I can't find an answer:

I have a bar chart, and I want to present which bars are significantly
different by placing a line with an asterisk above then (similarly to fig. 3
in: http://jnm.snmjournals.org/content/46/4/574.figures-only).

Does anyone have a reference where can I find some instructions how to learn
this?

Thanks a lot!
Omer

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