Table 2.

Accelerometers and corresponding measured eigenmodes.

Eigenmode	ACC1	ACC2	ACC3	ACC4
Eigenmode 1	X	X	X	X
Eigenmode 2	O	X	X	O
Eigenmode 3	X	X	X	O
Eigenmode 4	O	X	X	O

X = eigenmode is measured, O = eigenmode is not measured.