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Specifies the direction of mass flow.
| Constant | Value | Description | 
|---|---|---|
| esriMassFlowAngleRepresentationFrom | 0 | The mass is flowing along the angle and moving towards the origin of the reference system. | 
| esriMassFlowAngleRepresentationTo | 1 | The mass is flowing along the angle and moving away from the origin of the reference system. |