2.2.53 Ledger_line_engraver
Create the spanner to draw ledger lines, and notices objects that need ledger lines.
This engraver creates the following layout object(s):
Ledger_line_engraver
is part of the following context(s): DrumStaff, GregorianTranscriptionStaff, MensuralStaff, RhythmicStaff, Staff, TabStaff and VaticanaStaff.