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Different ways of estimating extents.
| Constant | Value | Description | 
|---|---|---|
| esriExtentFirstOf | 0 | The first of all extents. | 
| esriExtentIntersectionOf | 1 | The intersection of all extents. | 
| esriExtentUnionOf | 2 | The union of all extents. | 
| esriExtentLastOf | 3 | The last of all extents. |