F Diminished :: F A♭ C♭

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