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Not that I know or understand this table, but just seems to look a bit odd - (the 64-128mph table doesn't have the "folded corner"). Does everyone's table look like this?
Your two graphs don't show anything starting over.
OK, I see what you're saying (I mis-read the 3 axis), BUT still have the question about the "folded-up corner" at mph's below 8mph...
You see how the Main Line Pressure (MLP) is dependant on ONLY TPS% AFTER 8MPH? The "column" at 8 MPH is repeated all the way thru the "column" at 128 MPH. (Why are the columns for 0 and 4 MPH different?)
In other words, AFTER 8 MPH, this could be a 2-dimensional graph (No need for MPH as a 3rd axis)
In table form, the highlighted area is where this is taking place: