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Fig. 7


Abundances vs. H2 as determined using the XCLASS software package for each of the sources modeled. All main isotope species modeled from more than one transition are shown. The column densities for vibrationally excited states were added to the ν = 0 state for CH3OH, CH3CHO, CH3CN, and cyanoacetylene (HC3N) to determine abundances. The CN-bearing species in both plots clearly indicate the missing emission in B1 and B2 for vinyl cyanide (C2H3CN) and ethyl cyanide (C2H5CN) and reduced abundances in B2 for CH3CN and HC3N. We stress that as these species do not always trace the same gas, these abundances are lower limits.

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