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Need to update the MBTA reference
The 2016 reference [Adams et al. CQG 33, 175012 (2016)] for MBTA is outdated. Please update to DOI 10.1088/1361-6382/abe913 [Aubin et al. CQG 38, 095004 (2021)]. This will be consistent with the references of the emfollowup usersguide that was recently [updated](https://git.ligo.org/emfollow/userguide/-/blob/main/analysis/searches.rst).
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