\version "2.15.41"

repeatDots = {
  \relative c' {
    \repeat volta 2 {
      c1 | c1
    }
  }
}

#(set-global-staff-size 16.375)

\score {
  \new Staff {
    \repeatDots
  }
}

\score {
  \new Staff {
    \repeatDots
  }
  \layout {
    \context {
      \Score
      \override StaffSymbol #'staff-space = #(magstep -3.75)
      \override StaffSymbol #'thickness = #(magstep -3.75)
    }
    #(layout-set-staff-size 10.0)
  }
}