Agilent Technologies Signal Analyzer N9030a - Manual (Page 370)

5 Legacy Command Descriptions
M4 [four] (Marker Zoom)
M4 OA
The OA option only returns the current value to the controller; it does not set the active
function to the active marker.
M4?
Query Data Type <real>
SCPI Equivalent Commands None
370 Remote Language Compatibility Measurement Application Reference