Fig. 4

Linear measurements: (1) U1 vertical position (2) U6 AP position (3) U6 vertical position (4) L1 vertical position (5) L6 vertical position (6) L6 AP position
Linear measurements: (1) U1 vertical position (2) U6 AP position (3) U6 vertical position (4) L1 vertical position (5) L6 vertical position (6) L6 AP position