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Fig. 1


Ground state rotational energy level diagram of ortho-, and para-CH2 up to an energy of 350 K, adapted from Brünken et al. (2004). Transitions measured in the laboratory are labelled with their respective transitions indicated by arrows. Highlighted in red and blue are the transitions that are discussed in this paper. The corresponding fine- and hyperfine structure transitions are not depicted here as they would not be visible on this scale.

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