Sony FX 6 Quick Start Manual page 60

Exposure: GAIN settings
3 dB of GAIN has been applied to this shot. The base ISO is low (320 ISO) and the lens is wide open
at f 4.5. The best option would be to increase the amount of light on the subject but if this cannot
be done, then a small amount or GAIN can be applied. The window has been deliberately
overexposed.
Base Low ISO
3 dB of Gain (M preset setting)