How to make a Line Chart curved instead of straight from point-to-point?

I have a Line Chart that is is very jagged and plots directly from point to point, like this:

http://img818.imageshack.us/img818/7408/testhb.jpg

But I want to achieve something that looks a bit smoother where the line instead is curved from point to point, like this:

http://download.oracle.com/docs/cd/E12839_01/bi.1111/b32122/img/curvedline_graph.gif

Is this possible in Xcelsius 2008?  I couldn't find anything in the graph's properties and I also had no luck when searching google/these forums for a solution.  Thanks for the help!