I am trying to plot 2 X-axis data with one Y axis. The Y-axis is just a dummy axis.

X1= 1 2 3 4 5
X2= 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4 1 2 3 4
Y = 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0


I can get X1 to display properly on the axis. But I don't see the repeated X2 values on the graph.