JFreeChart not plotting sequentially

Question

I'm facing one problem while plotting JFreeChart. I have 5 series(lines) to plot on a graph. In those 5 series, 1 series has a different x coordinates (In the graph you can check in end 74 is there for p25.). This creates problems. How can fix it so as not to show 74 in the last? instead show it after 72 in ascending order.