A B 71 dB

C A 70 dB

D A 72 dB

C A

E B

D C 73 dB

D B 73 dB

D B 73 dB

D B 73 dB

D A 73 dB

B B 70 dB

C B 72 dB

C B 70 dB

C B 70 dB

B A 69 dB

C B 73 dB

D B 73 dB

C A 70 dB

D A 73 dB

C A 70 dB