Agilent Technologies HP 1660E Series User Manual page 234

Triggering Examples
Special Displays
8 Select the name of the other analyzer and the label to interleave.
Interleaved data is displayed in a light shade. Trace list line numbers of
interleaved data are indented. The labels identifying the interleaved
data are shown above the labels for the current analyzer, and are
displayed in a light shade.
If you have problems with the procedure, check that each analyzer has
an independent clock from the target system.
Interleaved Trace Lists on the HP 1661EP
234