Fig. 1
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Examples of reduced and calibrated spectra for the NH3 (1, 1), (2, 2) and (3, 3) transitions. The transition is indicated in the upper left corner of each panel. For the first two sources the fits are shown in red. The (3, 3) transition was detected only towards RNO 1B/1C and V512 Per (SVS 13A). The full version of the figure and the FITS files for the NH3 detections are available at https://zenodo.org/record/7736131
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