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<i>Herschel</i>observations of ortho- and para-oxidaniumyl (H<sub>2</sub>O<sup>+</sup>) in spiral arm clouds toward Sagittarius B2(M)
H2O+ has been observed in its ortho- and para- states toward the massive star forming core Sgr B2(M), located close to the Galactic center. The observations show absorption in all spiral arm clouds between the Sun and Sgr B2. The average o/p ratio of H2O+ in most velocity intervals is …