This chord is played start on fret 1 Minor seventh chord with added 13th (6th). Most of the time the 5th is left out (3rd note). The 13th = 6th 13th is used when the chord is a 7th chord with added 6th 6th chords are not 7th chords with added 6th.
Scale structure: R-m3-5-m7-13
Note: F Ab C Eb D
Alternative names: Fminor13, Fmin13, Fm7/13, Fm7(add13), F-7(add13), F-7/13, Fmin7/13, Fmin7(add13), Fm7/6, Fm7(add6), F-7(add6), F-7/6, Fmin7/6, Fmin7(add6)
Importance: Rarely used