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Fig. 6

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Auscultation dans la période de novembre 2013 à mai 2017. Réponses des capteurs à corde vibrante. (a) Boulon instrumenté B25 ; (b) Boulon instrumenté B35.
Monitoring in the period from November 2013 to May 2017. Sensors responses. (a) Instrumented bolt B25; (b) Instrumented bolt B35.
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