%% http://lsr.di.unimi.it/LSR/Item?id=640

\layout {
  \context {
    \Voice
    \override BreathingSign.font-name = #"Helvetica"
    \override BreathingSign.font-size = #8
    \override BreathingSign.text = #(markup (#:raise 0.2 ","))
  }
}
\new Staff {
  \relative c'' {
    b4 b \breathe b b
  }
}