Center graphical markup on staff

[Nuno Trocado]

Hi everyone!

How can I have the wiggly line in the example below centered inside the staff?

Thanks,

Nuno

\score {

  \relative c' {

    c4 d

    s-\markup \override #'(height . 2) \draw-squiggle-line #1 #'(8 . 0) ##f

  }

}