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I have no clue what this plot even means. . .
As for the height, the rule of thumb I use is 40-42" for seated ear level unless you're under 5'6" and/or you have extremely low seating. Std 8' high rooms (96") compared to 40-42" is approx 41-43%. Anywhere between 40 and 50% is a place to be avoided if possible - which in the height, rarely can be. 9' ceilings don't present the problems that 8' ceilings do.