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System Operation3.11.7 Offset GraphsThe two Offset Graphs blocks represent the gain and phase uniformity of the receivingchannels in the Sonar Head. Slight variations are normal. As the cursormoves within borders of a graph, the receiver channel number, board number, itsoffset value, and the average value appear just below the graph.Figure 16, Receiver Gain OffsetsReceiver Gain Offsets:Condition Color ValueAcceptable Green