20"

D B 72 dB

C A 70 dB

D C 71 dB

D A 73 dB

B A 72 dB

C C 73 dB

C C 72 dB

C B 71 dB

C D 70 dB

C C 74 dB

C C 71 dB

D D 73 dB

A D 70 dB

D C 73 dB

C A 75 dB

C A 72 dB

C A 72 dB

C A 72 dB

B E 73 dB

C B 69 dB

C B 71 dB

A B 71 dB