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The Default Background Transition Distances for New Documents.
[Visual Basic .NET]
Public Sub GetDefaultBackgroundTransitionDistances ( _
    ByRef lowAltitude As Single&, _
    ByRef highAltitude As Single& _
)
[C#]
public void GetDefaultBackgroundTransitionDistances (
    ref Single& lowAltitude,
    ref Single& highAltitude
);