A A 70 dB

C B 70 dB

C B 72 dB

C B 72 dB

A B 72 dB

C B 73 dB

C B 73 dB

B A 71 dB

C C 71 dB

C A 71 dB

C A 71 dB

D C 73 dB

C C 70 dB

C C 73 dB

C C 73 dB

C C 70 dB

A C 70 dB

C B 73 dB

C B 70 dB

B B 72 dB