I'm not sure if this is the best chart to use or not, but I'm plotting my
data in a Stacked Area chart. I need to show a vertical line at the "Median"
value as shown below. So I have the "CB Score Groups" along the horizontal
axis and the "# of accts" along the vertical axis. My Median score is 709.
How can I add this as a vertical line?

"CB Score
Group" "# Accts"
0 - 599 550
600 - 619 281
620 - 639 448
640 - 659 643
660 - 679 803
680 - 699 946
700 - 719 899
720 - 739 853
740 - 759 742
760 - 779 872
780 - 799 691
800 - 819 375
820 - 839 143
= 840 11

Thanks!