Gain Frequency
Flex Apps:
FlexPLL
The Gain Frequency measurement is the frequency at which the model JTF curve and the model OJTF curve intersect.
with Zero, Pole, and Gain Frequencies

SCPI Command
:MEASure:RESPonse:PLLModel:FGAin?
:MEASure:RMEMory:PLLModel:FGAin?