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Google charts with unequally spaced data

Project:Charts and Graphs
Version:6.x-2.7
Component:Miscellaneous
Category:support request
Priority:normal
Assigned:Unassigned
Status:active

Issue Summary

I am trying to mimic the lxy example in

http://code.google.com/apis/chart/image/docs/gallery/line_charts.html#ax...

but I get no line (even if axes ranges are correct) and the following

warning: reset() expects parameter 1 to be array, null given in ...

<?php
function co2_it()
{
$canvas = charts_graphs_get_graph('google-charts');
$canvas->parameters['cht'] = "lxy";
$canvas->colour            = '#ffffff';

$canvas->parameters['chxt'] = "x,y";
$canvas->parameters['chxr'] = "0,2000,2009|1,0,700";
$canvas->parameters['chd']  = "t:2000,2003,2004,2005,2006,2007,2008,2009|693,651,582,547,534,518,503,468";


$out = $canvas->get_chart();
return
$out;
}
print
co2_it();
?>

What am I doing wrong?

Thanks for any hint,