semi_tie->set_object ("note-head", inf.grob ()->self_scm ());
Pointer_group_interface::add_grob (semi_tie_column_, ly_symbol2scm ("ties"),
semi_tie);
semi_tie->set_parent (semi_tie_column_, Y_AXIS);
semi_ties_.push_back (semi_tie);
semi_tie->set_object ("note-head", inf.grob ()->self_scm ());
Pointer_group_interface::add_grob (semi_tie_column_, ly_symbol2scm ("ties"),
semi_tie);
semi_tie->set_parent (semi_tie_column_, Y_AXIS);
semi_ties_.push_back (semi_tie);