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Release branches have names like "igb_6_4" and correspond to major releases of the software built for end users. These should never be removed from the repository and should not be editing edited except by the group managing releases for end users. (As of this writing, the team at UNC Charlotte led by Ann Loraine manages the release cycle.) If bugs are discovered after a major release, we correct the problem on the latest branch and release a new version to the public as a "dot release," e.g., 6.4.1 is the first bug fix release of IGB version 6.4.
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