DH-132 Tanker's helmet and E.A.R. Earplug		
USAARL 01 Oct 1976		
Freq(Khz) Mean_Gain(dB) StDev_Gain(dB) Note: -10dB Gain = 10dB Attenuation		
0.075	-28	5.7
0.125	-33	6.5
0.25	-43	10
0.5	-50	8.2
1	-41	6.1
2	-40	6.7
3	-52	7.8
4	-58	4.9
6	-54	6.4
8	-52	5.4
