base_lengths_.push_back (y / staff_space_);
stem_xpositions_.push_back (s->relative_coordinate (common[X_AXIS], X_AXIS) - x_pos[LEFT] + x_span_);
stem_ypositions_.push_back (s->relative_coordinate (common[Y_AXIS], Y_AXIS) - my_y);
base_lengths_.push_back (y / staff_space_);
stem_xpositions_.push_back (s->relative_coordinate (common[X_AXIS], X_AXIS) - x_pos[LEFT] + x_span_);
stem_ypositions_.push_back (s->relative_coordinate (common[Y_AXIS], Y_AXIS) - my_y);