To find the chart's SVG code, use:
$("#chart_div").find("iframe").contents().find("#chart");
There really isn't anything that distinguishes the sub-elements of the
chart, though (at least, if there is, I haven't been able to discern it).
Google doesn't use any names or id's for anything inside the SVG code, so
you have to guess at which elements are the one's you're looking for.
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