D A 73 dB

D A 72 dB

B B 75 dB

C C 75 dB

C B 72 dB

B B 72 dB

D B 74 dB

A B 75 dB

C A 74 dB

C B 73 dB

C A 73 dB

C B 73 dB

C A 70 dB

C A 73 dB

C C 73 dB

C B 71 dB

B A 71 dB

B B 73 dB

C A 74 dB

D C 72 dB