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Fig. 1
From left to right, we show sample 16 GHz spectra of the sources IRDC048.6, HMPO18151, HMC029.96, and UCH013.87, representing the four selected evolutionary stages of high-mass star formation. The frequency resolution is ~0.2 MHz and typical rms values are ~0.1 K at 1 mm and ~0.03 K at 3 mm.
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