Fig. 4.

Top: positions of the 466 and 498 index actuators and their associated inverse eigenvalues (best case). Center: position of the 466 and 591 index actuators and their associated inverse eigenvalues (average case). Bottom: position of the 466 and 390 index actuators and their associated inverse eigenvalues (bad case). In the third column, the highest of the inverse eigenvalues do not exceed the same threshold and appear bright.
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