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Phase-lag sample
IRAS 01037+1219
OH 127.8+0.0
OH 138.0+7.2
OH 141.7+3.5
IRC +50137
IRAS 05131+4530
OH 16.1-0.3
OH 20.7+0.1
OH 26.5+0.6
OH 30.1-0.7
OH 32.0-0.5
OH 32.8-0.3
OH 39.7+1.5
OH 44.8-2.3
OH 55.0+0.7
IRAS 20234-1357
OH 75.3-1.8
OH 83.4-0.9
IRAS 21554+6204
OH 104.9+2.4