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...plate[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 [[alternative HTML version deleted]]