Guitar Chord Fret Diagram - "T" above string fretted with thumb

[tone]

I would like to place the letter "T" above the strings fretted with my thumb. 
This is usually only the low E string.  Some chords require five fingers. 
Other chords are more conveniently played with the thumb on the low E.

Here is a picture I edited with an external program to include the letter
"T" above the low E string:

<http://lilypond.1069038.n5.nabble.com/file/n179738/Fret_Diagram_with_Thumb.png>
 

I am looking for the simplest solution, not necessarily the most efficient. 
I have scoured the web, and have not found a satisfying method to achieve
this.  Any help is appreciated.  Below is a minimal working example. 

*LilyPond Code*
---------------------------------------

---------------------------------------

*Files*
ly:   Fret_Diagram_without_Thumb.ly
<http://lilypond.1069038.n5.nabble.com/file/n179738/Fret_Diagram_without_Thumb.ly>
  
pdf:   Fret_Diagram_without_Thumb.pdf
<http://lilypond.1069038.n5.nabble.com/file/n179738/Fret_Diagram_without_Thumb.pdf>
  
png:   Fret_Diagram_with_Thumb.png
<http://lilypond.1069038.n5.nabble.com/file/n179738/Fret_Diagram_with_Thumb.png>
  





--
View this message in context: 
http://lilypond.1069038.n5.nabble.com/Guitar-Chord-Fret-Diagram-T-above-string-fretted-with-thumb-tp179738.html
Sent from the User mailing list archive at Nabble.com.