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Fig. 1


Herschel-HIFI observation of four extreme OH/IR stars. The spectra have been corrected for the LSR velocity for each object and rebinned to ~2 km s-1 sampling. The vertical lines indicate the expected position of the HO, HO, and HO 312−303 transitions, from left to right. The expected position of the HO 111−000 transition (dashed line) from the upper side-band can be seen at the far right.

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