How to plot multiple density plot and scatter plot together

Dear all,
 I want to plot kernal density of two set of data (theses both data set
have same shape) and I want to insert  scatter line segment plot (
http://stackoverflow.com/questions/24931006/r-simple-scatter-plot-with-vertical-lines)
on this same plot.

I can make two density plot together(I have attached that plot), but
together with these density plot, I cannot include scatter line-segment
plot on this density plot.

Thank you all in advance

DILEEPKUMAR. R
J R F, IIT DELHI
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