Nation

For the record

- Correction: Because of reporting errors, a story in Thursday’s Metro section about tree cutting to prevent power outages provided an incorrect figure on the number of people left without power after an October 2011 snowstorm. Roughly 4.3 million customers across the eastern United States lost power, including 600,000 in Massachusetts. Also, the story provided incorrect information about the extent of the project. As part of its five-year cycle, NStar is scheduled to finish clearing land in roughly 400 miles of transmission line by 2015. It has hired an arborist to discuss the cutting with residents.

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