Fig. 4

D/H isotopic ratio in the carbene isomers H2CCC and c-C3H2 in three dense cores in the Taurus molecular cloud: TMC-1, TMC-1C, and L1544. For c-C3H2, the heights of the bars indicate the average value, and the error bars the range of values inferred in previous studies of TMC-1 (Turner 2001) and of TMC-1C and L1544 (Spezzano et al. 2013).
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