20"

C E 71 dB

B A 71 dB

D E 70 dB

C B 72 dB

C A 70 dB

C E 71 dB

B E 71 dB

C C 72 dB

B C 72 dB

B B 71 dB

C D 70 dB

B A 72 dB

B A 71 dB

B B 70 dB

C A 71 dB

D C 70 dB

D A 69 dB

B A 72 dB

A B 72 dB

A B 73 dB

D A 72 dB

D A 73 dB