I found this in the Black Clouds & Silver Linings - Dream Theater Guitar Tab Book. The notation implies a harmonic on the second and third strings, but what do 2.7 and 3.2 mean?
1 Answer
I believe that this is referring to where you would place your finger to get the desired harmonics. The harmonic that generates the major third is right before the 4th fret, which would be 3.85. 3.2 would be a harmonic near just beyond the 3rd fret, which should give you a D on the G string. This picture outlines the placement of the harmonics and the decimal representation for some of them. Looking at the harmonic that shows not in parentheses in your example, the image doesn't match decimal-wise but you can see that the note that corresponds is the same.
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The harmonic that generates the (major) third (plus two octaves), namely the 5th harmonic, is right before the fourth fret, 3.85 to be precise. 3.2 is indeed the sixth harmonic (two octaves and a fifth), and 2.7 is the seventh harmonic, which on the B string is close to A6 (but significantly lower than a proper fifth up from the D6 harmonic on the G string). Mar 25, 2017 at 20:38
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@leftaroundabout Thanks! I had originally written 4th and 3.8/3.9 and somehow convinced myself that I was wrong. Probably didn't help that I was nowhere near my instrument. Mar 27, 2017 at 13:25
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@BraddSzonye - Does the newly added picture clarify things for you? Mar 28, 2017 at 18:49
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It'd be cool to have a guitar with these positions marked with inlays. Dec 4, 2018 at 18:00