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Images in Figure 4C and Figure 8C (Sh142+Sj7170 and Sh771+Sj7170) were inadvertently misused. The correct panels of Figure 4C and Figure 8C are shown below. All authors agree that the corrections do not affect the results and conclusions of the article. The authors apologize for those mistakes.
Figure 4C
Figure 8C
VOLUME 289 (2014) PAGES 11667–11680
