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Fig. 1

image

Twenty-five raw spectra obtained with the PACS 5 × 5 detector array and extracted from one of the 3 × 3 raster map positions on Saturn at 66.44 μm. The H2O line is detected in all spectra corresponding to pointings on the planetary disk or close to the planetary limb. Spectra without an H2O line correspond to pointings far off the planetary limb. Before fitting the lines with a Gaussian to compute their area, a polynomial baseline was removed from these spectra. The line peak S/N around the limb is ~15–45.

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