Notes. The numbers in parentheses represent the three sigma errors in units of the last significant digits. (a) Derived from the LVG model. [X] represents the abundance of X, and the [X]/[Y] ratio can be obtained from the column densities of X and Y, assuming that both molecules exist in the same region. (b) Derived from the integrated intensity ratio of the strongest hyperfine components of C13CH and 13CCH.
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