[R] Labelling certain points on the x-axis

[squall44]

Hello,

I created an empirical distribution function:

x = c(1.6,1.8,2.4,2.7,2.9,3.3,3.4,3.4,4,5.2)
F2.5 <- ecdf(x)
plot(F2.5, 
     verticals= TRUE, 
     do.p = TRUE, 
     lwd=3, 
     ylab = "f(x)", 
     xlab = "x", 
     main = "Figur 2.5 Empirische Verteilfunktion", 
     xlim = c(1,5.5))
abline(h= (0:5)*0.2)

Now I would like to label the points on the x-axis where there is an
x-value:

http://www.nabble.com/file/p12231344/figur.gif 

I don't know how to do that... can anyone help me?
Thanks
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