Results of H₂CO abundance models: total flux integrated over the emission rectangle of the observations for different abundances for model 1 (purple), model 2 (blue), and model 3 (red). The fractional abundances with respect to CO for model 2 have been multiplied with 10^-4 for easier comparison as the CO/H₂ abundance is typically 10^-4. The dotted line indicates the measured observed flux, and the gray bar indicates the error on this value based on the flux calibration uncertainty.