Sony FX 6 Quick Start Manual page 98

Cine EI Shooting Mode
Most of the previous section on Custom Shooting Mode Exposure
applies to Cine EI mode.
The controls for iris, white balance, and ND filters are the same.
However, Cine EI is for exposing Slog 3 images so there are differences
in how you arrive at the optimal exposure.
The two Base Sensitivity ISO ratings are different from Custom mode.
It is not possible to do GAIN and ISO changes in Cine EI mode, instead
you can use EI ratings to generate an "offset" on the exposure while
using a LUT.