Valid values are between 0.0 and 1.0, where 0.0 indicates straight lines, and 1.0 indicates lines with the highest curvature. A typical value is 0.5. These values for Tension for a Closed Curve object are shown in the following bitmap:
Target Platforms: Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2