Plotting Mean in plotting degree distribution

Hi,

I am plotting degree distribution of a graph using the function,

library(igraph)
dd1 = degree.distribution(G)

plot(dd1, xlab = "degree", ylab="frequency")

I would like to plot the mean of the distribution as a vertical line in the
attached plot.
Please let me know how to do this.

Thanks,
Kumar http://r.789695.n4.nabble.com/file/n3334375/cdata3_dd.png
cdata3_dd.png 

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