\harmonicByFret #2.7

[Federico Bruni]

Hi,

I was looking at this snippet:
http://lsr.dsi.unimi.it/LSR/Item?id=819

can anyone explain which fret is 2.7? :-)

This snippet is included in the documentation, inside a section for 
*fretted* instruments:

http://lilypond.org/doc/v2.15/Documentation/notation/common-notation-for-fretted-strings#index-harmonic-indications-in-tablature-notation

At first I thought it was an output bug, but then I see that it was 
intended.
So I guess that, not surprisingly, I'm missing something about 
harmonics.  Maybe this explanation could be added to the documentation.

Thanks,
Federico