Vaticana episema in general music script

[Ben Hillen]

I am relatively new in Lilypond and am looking for a way to give a group of
three notes one episema above the beam as in Vaticana script.
Beneath some code a tried. In general script no episema appears. Is there a
way for creating such?
Wo can help me?


\version "2.16.2"

\include "gregorian.ly"

\new Voice {
  \revert Score.SpacingSpanner #'packed-spacing
  a'8 [b'a']  
  \[ a'8\episemInitium  [b' a']] \episemFinis \]
}

\new VaticanaVoice {
  \revert Score.SpacingSpanner #'packed-spacing
  a8 b a  
  \[ a8\episemInitium b a] \episemFinis \]
}




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