Agilent Technologies ESA-E Series User And Programming Manual page 52

Making Modulation Analysis Measurements
Interpreting Measurement Results
3. Figure 4-17
that with a gain imbalance, the I and Q eye diagrams will not be
similar in shape, and these shapes will be swapped back and forth
between each other. In this figure, the Q eye diagram vertical
amplitude (item 1) is greater than that of the I eye diagram (item 2.)
Figure 4-17 Eye Diagram Showing an I/Q Gain Imbalance
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shows the same signal using the eye diagram. Observe
Chapter 4