I find the best way is to use jQuery to get the chart's iframe contents (I have posted about this here<https://groups.google.com/d/msg/google-visualization-api/22N0T30LY3k/D9sSQXbFuTQJ>, here<https://groups.google.com/d/msg/google-visualization-api/22N0T30LY3k/YrPl9TaHYUwJ>, and here<https://groups.google.com/d/msg/google-visualization-api/WifdoMOea9M/zRTsQAAWn64J>as examples). You'll have to study the structure of the SVG to figure out what you need to change.
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