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Highcharts by Highsoft AS - www.highcharts.com (license and pricing)
(used by Facebook, Twitter, Yahoo!, VISA, NOKIA, MasterCard, Ericsson, and others)

Basic line
Time series, zoomable
Basic column
Stacked and grouped
Basic area
Area range
Pie chart
Donut chart
Scatter plot
DYNAMIC - Spline updating each second
Gauges
Solid gauge
Polar chart
Pyramid chart
Geographic map

Click countries to view history