+ vector<Real> get_footnote_heights_in_range (vsize st, vsize end);
+ vector<Real> get_in_note_heights_in_range (vsize st, vsize end);
+ vector<Real> internal_get_note_heights_in_range (vsize st, vsize end, bool foot);
+ vector<Grob *> get_footnote_grobs_in_range (vsize st, vsize end);
+ vsize num_footnotes ();