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SA4 output voltage signal of L-CFST2. (a) SA4 output voltage signal in the healthy state; (b) SA4 output voltage signal under 5 mm; (c) SA4 output voltage signal under 10 mm; (d) SA4 output voltage signal under 15 mm; (e) SA4 output voltage signal under 20 mm; (f) SA4 output voltage signal under 30 mm.
