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Add the return number to be excluded from thinning - points with this return number will always be selected.
[Visual Basic .NET] Public Sub AddPreservedReturn ( _ ByVal ret As esriTerrainLasReturnType _ )
[C#] public void AddPreservedReturn ( esriTerrainLasReturnType ret );
[C++]
HRESULT AddPreservedReturn(
esriTerrainLasReturnType ret
);
[C++] Parameters ret [in]
ret is a parameter of type esriTerrainLasReturnType