vertical spacing

[Ole Schmidt]

Dear all,

I want multiple litte examples- everyone with an extra title-  on one page.
How can I control the vertical spacing between those (two) systems.
All I've tried had no effect...
Thanks for a hint

ole

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\version "2.13.7"

\header { tagline =  ##f }
 \layout {     \context
      {  \Score
      \remove "Bar_number_engraver"  }   }
      \paper { indent= 0\cm  ragged-right= ##t}
\book {

\score {
\new Staff {
\relative c'' {
        g8 f f2. |\break
        c4 bes4 r2 }
}
\header { piece = "One"
    opus =  "Kurzfassung"
}
}

 \score {
\new Staff {
\relative c'' {
        g8 f f2. |\break
        c4 bes4 r2 }
}
}
\header { piece = "Two"
    opus =  "Kurzfassung"
}

 }

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