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Figure 3: Mean DPOAE values for eight Breachers and three Engineers for On-Site (Quantico) and Baseline (WR site) measurement conditions. Data are not shown for subjects 8, 10, 11, and 15, who did not have DPOAE measurements at both sites. In measurements where the DPOAE signal value was lower than the noise floor, the signal value was set to be equal to the noise (this occurred in 472 out of 2632 measurements). The light shaded area shows the mean On-Site noise floor, and the dark shaded area shows the mean Baseline noise floor. The dotted red lines show the 5th and 95th percentile normative range for DPOAEs. The mean values for both subject groups were well within the normal range, and above the noise floor

Figure 3: Mean DPOAE values for eight Breachers and three Engineers for On-Site (Quantico) and Baseline (WR site) measurement conditions. Data are not shown for subjects 8, 10, 11, and 15, who did not have DPOAE measurements at both sites. In measurements where the DPOAE signal value was lower than the noise floor, the signal value was set to be equal to the noise (this occurred in 472 out of 2632 measurements). The light shaded area shows the mean On-Site noise floor, and the dark shaded area shows the mean Baseline noise floor. The dotted red lines show the 5<sup>th</sup> and 95<sup>th</sup> percentile normative range for DPOAEs. The mean values for both subject groups were well within the normal range, and above the noise floor