G Diminished :: G B♭ D♭

F
C
G
D
G
♭5
G
♭3
♭3
G
♭5
G
♭5
♭3
♭3
♭5
⬤ ⬤
G
⬤ ⬤
B♭ Major 6th :: B♭ D F G

F
C
G
D
5
6
3
6
3
B♭
5
B♭
5
6
6
3
B♭
3
B♭
5
⬤ ⬤
5
6
3
⬤ ⬤