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Fig. 1

image

SPIRE beams and the field of view of the central PACS spaxel overlaid on an archival PACS 70μm image of Arp 299. The large circle represents the largest SPIRE beam with a full-width-half-maximum (FWHM) of ~ 42′′ at a wavelength of ~ 670μm and the smaller circle represents the smallest beam with a FWHM of ~ 16′′ at a wavelength of ~ 200μm. The dashed square represents the central 9.4′′ spaxel of the PACS spaxel array. Evidently the far-IR emission of the system is dominated by Arp 299A, which is unresolved by PACS at 70μm. The coordinates are in the J2000.0 system.

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