Ortho-H3O+(4) line at 1031 GHz observed toward the high-mass objects. The observed line is fitted by a Gaussian (red) and its parameters are given in Table B.1. An SO line at +10.1 km s-1 relative to the systemic velocity and lines from the other sideband appearing at 6 and 8 km s-1 are blended (see text).
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