Agilent Technologies ESA Series User's/Programmer's Reference page 272

Remote Command Reference
COUPle Subsystem
NOTE Although marker count, gate time, and marker trace have auto settings, they are not
affected by Couple.
Factory Preset
and *RST:
Front Panel
Access:
272
Sweep points
Phase noise optimization
Phase Noise Optimization (Firmware revision A.08.00 or greater)
Span
All
Auto Couple, Auto All
Chapter 5