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The states are characterized in Table 2 as a function of the activation of model-based tests, except the calibration state, which is clearly known by the WU maintenance department.

Table 2

Fault signatures based on the models' residuals

PDANNCause
Distribution sensor fault 
Distribution sensor fault 
Quality event 
Normal state 
PDANNCause
Distribution sensor fault 
Distribution sensor fault 
Quality event 
Normal state 

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