Fig. 9
Comparison between the HCN(1 − 0) spectrum (black) in L1448 and a synthetic spectrum generated using SiO(2 − 1) as a template (red). Note the good match between the two histograms in the f-wing and the large difference in the EHV regime. This change of behavior indicates a higher (factor of 20) change in the SiO/HCN abundance ratio between the f-wing and the EHV regime.
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