vertical distance within verses

[Robert Garrigos]

I have a song which sets lyrics like this:


\score {
  <<
    \new Voice = "mel" {
      \relative c'' {
        \clef treble
        \key c \major
        \time 6/8

        | g8. e16 g8 a8. f16 a8
        | g4 (f8) e4.
      }
    }
    \new Lyrics \with {
      \override VerticalAxisGroup.nonstaff-relatedstaff-spacing.padding = #2
    }
    \lyricsto mel {
      \lyricmode {
        <<
          {
            La pas -- to -- ra Ca -- te -- ri -- na
          }
          \new Lyrics = "secondVerse" \with { alignBelowContext = "catala" }
          {
            Oh, bons pas -- tors jo di -- ri -- a
          }
          \new Lyrics = "therdVerse" \with { alignBelowContext = "catala" }
          {
            Sant Jo -- sep per la mun -- ta -- nya
          }
        >>
      }
    }
  >>
  \layout {
  }
}

Which gives me this:


How can I set a wider vertical space within verses?

Thanks.

==========================
Robert Garrigós i Castro