R help - Jan 2007 - How can I generate line segments between two sets of points on the same graph?

I am drawing two plots on the same graphics device window as follows:
 
yLim<-range(range(template),range(slope*subSeries) )

plot( template, type="p", pch=19,cex=1.75,lwd=2.5,lty=1, ann=F,
axes=F,frame.plot=T,col="red", ylim=yLim,new=T )

title( main = "myDotChart of original template and subSeries vs time"
);points( slope*subSeries, type="p", pch=15,cex=1.35,lty=2,lwd=2.5,
col="blue", ann=F )



I want to connect the two corresponding points at the same x-coordinate ( x-axes
is shared by both plots essentially). I want to connect the template points to
the subSeries points at each x-coordinate.

The x-axes is 1:30 in both plot and the points;



Here's an example for the 2 points trying to connect two points for the
x-coordinate = 3:

 

segments(3, template[3], 3,subSeries[3],  col= "black",lwd=2)Now
here's what I get: a black line from the x-axis to the point: c(3,
template[3])In other words the above statement acts the same as: segments(3,
template[3], 3, 0,  col= "black",lwd=2);I cannot make segments or
lines that connect two points at the same x-coordinate.I also tried this:
segments(3.1, template[3], 2.9,subSeries[3],  col= "black",lwd=2)
whichstill drew a line starting at the x-axes, ignoring the subSeries[3] point
altogether.How can I generate line segments between two sets of points on the
same graph?Sincerely,Lloyd L
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