B A 72 dB

B A 72 dB

C A 73 dB

A A 72 dB

D C 73 dB

B A

C B 72 dB

C A 73 dB

D C 73 dB

D B 73 dB

D B 73 dB

C B 73 dB

C B 71 dB

C B 72 dB

C A 72 dB

A A 72 dB

C A 72 dB

B A 73 dB

C B 73 dB

D C 73 dB