Agilent Technologies N4413A User Manual page 140

Menu Reference
Setup Menu
You can proceed with making a new 3-port measurement.
NOTE If you change the configuration from 4-port to 3-port for an existing
measurement, and then change it back to 4-port by selecting Setup > 4-Port,
the missing plots are displayed and the data from those plots is restored.
1 Single-Ended, 1 Balanced Port Transform
In 3-port mode, you can transform from "2 single-ended and 1 balanced port" to "1
single-ended and 1 balanced port".
130 Chapter 5