PACS line scan OH spectra of the low-mass class 0 young stellar objects in our sample. The x-axis is wavelengths in μm, the y-axis is continuum subtracted flux density in Jy (plus a constant offset). The red dashed lines indicate the rest frequencies of the OH transitions. The blue dotted line represents the rest frequency of CO(31–30), which is blended with OH at 84.42 μm. The sampling of range scans (Ser SMM1 and NGC 1333 IRAS 2A) is different from line scans.
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