T_Yunit
This is a Data Header variable.
Type = Short
T_YUnit is a value which indicates whether the Y-axis units were power or not when the trace was saved. For a list of the unit associated with each value, see TraceYUnitType enumeration in the .NET API 1) Access Preamble Indicator, or 2) Application Programming Interface Reference.
The T_ variables describe the display setup when the trace was saved. When you recall and display a saved trace, the VSA uses the T_ variables to restore the display settings to their settings when the trace was saved.