Top: superposition of line profiles of various molecules of the first molecular class (see text) toward the high-mass object W3 IRS5. The line intensities are scaled and shifted to allow better comparison (CH: TMB + 1.5 K; C+: 0.01TMB + 1.4 K; CH+: 0.25TMB + 1.0 K; OH+: TMB − 0.5 K; H2O+: 2TMB − 3.7 K). The systemic velocity of the YSO, −38.4 km s-1, is indicated with a vertical red dashed line. Bottom: same as top for the low-mass object Ser SMM1 (C+: 0.5TMB − 0.2 K; CH+: TMB + 0.5 K; OH+: TMB + 0.5 K; H2O+: 2TMB − 0.45 K).
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