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Thanks Lexa, that helps me a lot to better understand it.
 
So what am I looking for? I need to understand the dynamic range of my sensor and check the exposure is within the range?
 
"Exposure adjustments just shifts numbers on X-axis because raw data not changed." Okay, so what do I need to do, or look for, or understand?
 
Sorry if I come across as an idiot, but when I look at an Lr histogram, (or Ps, or other image viewers) I understand them but with FRV the histogram just confuses me.