First (m(r), top panel) and second (σ(r), bottom panel) polar moments of the residuals (right column images of Fig. 1 + ) as a function of the distance r to the image centre. The different lines represent the kernel types used for the homogenisation: Gaussian (red dotted), circular (green long dashed), ADGS11 (black dashed) and effective (blue solid, this work). The vertical black dotted line indicates the HWHM of the SPIRE 350 μm PSF.
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