\chordmode problem?

[Menu Jacques]

Hello folks,

I get this score:

from what seems to be the reasonable LP code below.

What should one write to get:

Thanks if you can help!

JM

%%%%%%%%%%%%%%%%

\version "2.19.65"

PartPOneVoiceOne =  \relative a' {
  \clef "treble" \key c \major \time 4/4 | % 1
  a4 \bar "|."
}

PartPOneVoiceOneChords =  \chordmode {
  | % 1
  c4:maj7.11+ \bar "|."
}


% The score definition
\score {
  <<

    \context ChordNames = "PartPOneVoiceOneChords" { \PartPOneVoiceOneChords}
    \new Staff
    <<

      \context Staff <<
        \mergeDifferentlyDottedOn\mergeDifferentlyHeadedOn
        \context Voice = "PartPOneVoiceOne" {  \PartPOneVoiceOne }
      >>
    >>

  >>
  \layout {}
  % To create MIDI output, uncomment the following line:
  %  \midi {\tempo 4 = 100 }
}

%%%%%%%%%%%%%%%%