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Fig. 5


H2CO 322 → 221/303 → 202 (top) and 321 → 220/303 → 202 (bottom) integrated intensity ratio map. Ratios are calculated when the H2CO 303 → 202 line emission is detected above 5σ. The top and bottom rows should be nearly identical, and the difference mainly comes from the CH3OH contamination in H2CO 322 → 221. The wedges at the sides show the line ratios. The beam size of 30″ is shown at the bottom-left corner. Sgr A is the origin for the offset coordinates and shown as a cross.

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