Fig. 6.

Average cumulative acoustic emissions (CumAE, red; 10-min averages), first derivative or AE activity (CumAEder 1, black; moving window interval: 15 min) and third derivative (CumAEder3, grey, moving window interval: 48 h) of Fraxinus excelsior L. registered by sensor AE₁ during dehydration. The endpoint of VC_AE corresponds to the local maximum of the third derivate after the maximum in AE activity, which was not yet reached as indicated by the continuous increase in third derivative at the end of the acoustic curve