google charts problem, no legends, documentation?

Issue Summary

hi there,
i'm using google charts but the output is not like expected.
- "example 2" from the tutorial is only showing ONE series auf data
- "example 2" is not showing axis-legends
did the api change? is the tutorial wrong?

and is there any more information on the data schema or is that http://drupal.org/node/233906 all?
some chart types need e.g. custom ranges (if you use e.g. a stacked chart the range will always be limited to the max value of the first series so the stacked data does not display if the resulting value is higher than the max of the first series) and i can't figure out how to set all these additional params. or does the modules data schema just support a minimum auf params being available by all chart providers- so most of the google charts api features cannot be used?

any help appreciated!