20"

C A 72 dB

C A 73 dB

A B 72 dB

B A 71 dB

A A 70 dB

A A 70 dB

A B 69 dB

A A 72 dB

B B 74 dB

A B 72 dB

A B 70 dB

D C 71 dB

C E 70 dB

C A 71 dB

D A 70 dB

B D 69 dB

B A 69 dB

C C 71 dB

C C 72 dB

A A 69 dB

B A 72 dB

C B 69 dB

B E 70 dB

C A 71 dB