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. Author manuscript; available in PMC: 2007 Mar 21.
Published in final edited form as: J Acoust Soc Am. 2001 Jan;109(1):216–231. doi: 10.1121/1.1326083

FIG. 7.

FIG. 7

(A) Mean objective and subjective attenuations for the helmet/earmuff combination ±1 s.d. (objective: solid curve and shading, six ears in six subjects; subjective: symbols and error bars, three subjects). Key to symbols and vertical lines as in Fig. 5. Also shown is the mean objective attenuation for earmuffs from Fig. 5(A) (dot-dashed curve). (B) Mean objective and subjective attenuations for the helmet/earmuff combination [solid curve and symbols from (A)], sum of mean earmuff and helmet objective attenuations (dashed curve), and mean objective attenuation for the helmet alone (dotted curve; six ears in six subjects).