Effective PACS 70 μm and SPIRE 350 μm PSFs on the left. The central column shows Gaussian, circular, and effective kernels for these PSFs computed following the procedure described in Sect. 3.1. The corresponding relative residual images (see Eq. (15)) are shown in the right column. The bottom kernel and residual image correspond to this work. All images are 120′′ × 120′′.
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