Bar lines appearing even with \stopStaff and \RemoveEmptyStaves

[ALEXANDRE FICAGNA]

Hy,

does someone know why, even with \stopStaff and \RemoveEmptyStaves,
the barlines on the upper staff stand still?
Below the code:

up= { \stopStaff s2*8 \startStaff
         % \set Staff.instrumentName = "m.e."
      s8 d8->  s d->    
        }

center=\relative c  {
   \time 2/4
  \clef bass
       ees8.\mf f,16  a'4^\open^+   aes,8 f8 ~ f4
      a'16 ees8. ~ ees8 aes, ~   aes8 f8 ~ f16 ees'16 aes,8
      a'4 ~ a16 f,8.   ees'4 ~ ees8 a16 f, ~ \break
      f8. aes16 ~ aes ees'8.   a4 ~ a8 aes,8 ~
      aes ees'8 ~ ees8. f,16 ~  f a'16 ees8 ~ ees16 f,8. ~
      f16 a'8. ~ a8 ees16 aes,16 ~  aes4 ~ aes16 f8. \break
  }

\score {
  <<
    \new RhythmicStaff = "up" \with {
         \remove "Time_signature_engraver"
         \remove "Bar_number_engraver"
       } \up
    \new Staff = "center" \center
    >>
\layout {
 \context {
    \Staff
    \RemoveEmptyStaves
   \override VerticalAxisGroup #'remove-first = ##t
  }
 }              
}

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