Fig. 1
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Best-fit LTE models of acetone spectra (red) at eight strong transitions overlaid on the ALMA spectrum of three example sources in CoCCoA (black). The upper energy levels and Einstein A coefficients are annotated in red text in the upper right. On the x-axis, only the central frequency of each line is labeled, but the velocity span of each panel is fixed at [−15, +15] km s−1.
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