\relative c' {
\time 2/4
- % from upper staffline (position 4) to center (position 0)
+ % from upper staff-line (position 2) to center (position 0)
\override Beam #'positions = #'(2 . 0)
c8 c
- % from center to one above center (position 2)
+ % from center to one above center (position 1)
\override Beam #'positions = #'(0 . 1)
c8 c
}