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The Y-axis labels for Figure 5A and Figure 5B are incorrect. The values should go from -110 (on bottom) to -70 (on top) for Figure 5A and from -95.6 (on bottom) to -55.6 (on top) for Figure 5B. Please see a corrected version of Figure 5 here: http://plosone.org/corrections/pone.0056862.g005.cn.tif
Competing Interests: No competing interests declared.
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