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Fig. A.4


Ortho-H2O+ () lines at 1115 GHz observed toward the high-mass objects. The position of the strongest lines shifted by the systemic velocity of the YSO is indicated with vertical red dashed lines. Their thickness indicates the theoretical intensities. Only the blue-shifted line of W3 IRS5 is fitted by a Gaussian (red, see text). Its parameters are given in Table B.1.

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