Hi,

You've specified your CHM parameter as "chm=N,000000,-1,,10" and it
looks like you specified -1 for the <series_index> portion of that
parameter, but I believe that only works for stacked bar charts.
You'll have to add additional CHM parameters sets for each group. The
first example in the "Overview" section shows how to accomplish this:

http://code.google.com/apis/chart/docs/gallery/bar_charts.html#introduction

Cheers,
Keith

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