You'll need to use two datasets to create the desired effect. Here's a
quick example:

http://chart.apis.google.com/chart?cht=lc&;
chs=200x125&
chd=t:40,60,60,45,47,-1,-1,-1|-1,-1,-1,-1,47,75,70,72&
chls=1,1,0|3,6,3

Good luck,
K
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