Results of H2CO abundance models: spectra integrated over the emission rectangle of the observations for different abundances for model 1 (purple), model 2 (green), and model 3 (red) for abundances 10-7 (dashed), 10-8 (solid), and 10-9 (dotted). The black spectrum represents the observational data. Abundances for model 2 are multiplied with 10-4 to translate the abundance w.r.t. CO to H2. The top figure shows the original models. The bottom figure shows the model spectra scaled to match the total flux of the observations.
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