FastReport uses Microsoft Chart library to display charts. This library will be included in .Net Framework 4.0. Now it is available as a separate download here:
This library requires .Net Framework 3.5 SP1. It is freeware; you can learn about its features here:
Microsoft Chart control
Let us highlight some features of Microsoft Chart:

- more than 30 types of series (bars, columns, areas, lines, bubbles, pie, circular, financial, pyramidal, ranges);

- 3D support;

- supports several series of different types in one chart;

- full control over appearance and behavior of each chart element.

Information about the Microsoft Chart control.

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