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This are exposure stats i mentioned in previous post

Inside FRV histogram has 15 stops total, -12EV is left most border of histogram, +3EV is right most stop of histogram.
This setting
is for Exposure Stats meaning after how many EV stops down from over exposed mark (+3EV) program will report under exposed pixels (on histogam in my previous post that spot marked with "UE -10").
Theoretically this gives idea that my camera has total 13 stops of usable dynamic range everything lower is just clipped shadows, however its only for photos taken on ISO 100, on higher ISO values clipping occurs much faster i think at ISO 3200 all you get is about one EV stop of dynamic range, i would not trust it too much for shots with high ISO (Of course author made adjustment for this as well in options "ISO-Based underexposure limit", but i have not played with this yet)