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This is an example of minimum price variation (also known as the minimum price increment or the minimum price fluctuation). All public quotes for US equities are displayed to the nearest penny. (Hidden quotes may be entered at sub-penny increments.) US stock indices follow this convention and thus quote to the nearest penny. The oil listing is odd indeed. ...
Take a look at http://www.modulusfe.com/stockchartsl/ They have a nice demo (requires Microsoft Silverlight plugin). You can zoom and scroll, add lines and technical indicators, save image etc. Also see this SO question.
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