D B 71 dB

E C 72 dB

D C 71 dB

C B 69 dB

N N

D A 73 dB

C B 71 dB

D A 73 dB

C A 73 dB

D C 73 dB

A B 69 dB

B A 70 dB

C B 72 dB

C B 71 dB

C A 73 dB

D A 72 dB

C A 69 dB

D B 72 dB