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