common[Y_AXIS] = common_refpoint_of_accidentals (apes, Y_AXIS);
common[Y_AXIS] = common_refpoint_of_array (heads_and_stems, common[Y_AXIS], Y_AXIS);
common[X_AXIS] = common_refpoint_of_array (heads_and_stems, me, X_AXIS);
common[Y_AXIS] = common_refpoint_of_accidentals (apes, Y_AXIS);
common[Y_AXIS] = common_refpoint_of_array (heads_and_stems, common[Y_AXIS], Y_AXIS);
common[X_AXIS] = common_refpoint_of_array (heads_and_stems, me, X_AXIS);