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In the Distance and Pulse Velocity modes it is at the top of the measure-
ment screen. In the Area Scan mode it is located in the A-Scan window
at the right side of the screen.
Press and drag on either end of the gate to adjust the range.
In order to find a suitable range, it is advisable to first carry out an auto-
matic pulse velocity estimation and then to do a quick B-Scan to deter-
mine the range of the back wall.