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Fig. A.1

image

Left: original 22 GHz spectrum in Arp 220 West (in black), the applied fit to account for the NH3 absorption (red) and the residual spectrum (blue). For clarity purposes the residual spectrum is shown at an offset in y by +25 mJy. Right: zoom into the NH3 (4,2) (top) and NH3 (3,1) (bottom) line features.

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