Dear all,
I would like to plot under the same plot
many curves like

mycdf<-ecdf(runif(100))
plot(mycdf)
curve(mycdf,from=-1,to=1)


mycdf<-ecdf(runif(200)+3)
plot(mycdf)
curve(mycdf,from=-1,to=1)

as you can see each new call to curve redraws (erases) the window. How I can have an effect like
plot(mycdf)
lines(mycdf2)
lines(mycdf3)

I would like to thank you in advance for your help

Regards
Alex

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