[R] Filling color's points in legend's plot in R

[Tsidkenu]

Hi! I'm new with R and I'm trying to do some plots but I have a problem with
the legend of this graphic because I want to fill the color's points in the
legend and I don't find any form to do it.I will really appreciate your
help. This is the code for legend's plot:

 >legend(10,90,legend=c("TR=100 años","TR=50 años","TR=25 años","TR=10
años"),lwd=2,pt.cex=1.5,bty='n',pch=c(24,22,21,23))

And this is the plot: 
http://www.freeimagehosting.net/x94f8


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