i dont have further details - but harmonics can reach very high levels above these.
http://www.angelfire.com/blues/tcguin111111/index2.html -argh the pic says the high e is at fret 24,but it's really fret 12 on 1st string :eek:-sorry.
One of the many things i don't know is website design.. so feel free to ignore the rest..whatever :)
If you do a search on frequency range guitar you may come up with more detailed stuff
Accuracy,you say? hmm interesting concept..