Fig. 1
Growth curves at 250 μm of the galaxies M 99 (HRS 102), NGC 3945 (HRS 71), and NGC 4550 (HRS 210). The different colored curves are obtained by changing the background estimate region as described in the text. The vertical red dashed lines correspond to the FWHM of the SPIRE beam at 250 μm. The right panels show the 250 μm images of the three galaxies, the black ellipses indicate the optical shapes of the galaxies.
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