How to show a staff and ledger lines without notes

\version "2.24.0"

%% http://lsr.di.unimi.it/LSR/Item?id=779

\relative c'' {
    \override NoteHead.transparent = ##t
    \override Stem.transparent = ##t
    \override Beam.transparent = ##t
    \override Dots.transparent = ##t
    \override Accidental.transparent = ##t
% For version > 2.14.2 comment in the following line
%    \override Flag.transparent = ##t
    cis'8. a,,
}