how to modify the legend?

[Rafael Rosolem]

Dear all,

I have a simple question:

I have a t-test plot of the precipitation where I define 4 different
levels of significance which are 75% (1.1517), 90% (1.6480), 95%
(1.9649), and 99% (2.6862). now I would like to replace the labels from
numbers to percentage. is there anyway I could do it? does someone have
a script which does that?

many thanks.

R.

ps: please find attached the figure.
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