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Feathered beams are not supported natively, but they can be faked by forcing two beams to overlap. Here is an example,
\new Staff << \new Voice { \stemUp \once \override Voice.Beam #'positions = #'(0 . 0.5) c8[ c c c c ] } \new Voice { \stemUp \once \override Voice.Beam #'positions = #'(0 . -0.5) c[ c c c c] } >>
This page is for LilyPond-2.6.3 (stable-branch).