a) DFOSC B-band image of SN 2005at obtained on 2005 April 19. b) FORS1 narrowband on-filter and c) off-filter images, centered at 4684 Å and 4781 Å respectively, of the explosion site of SN 2005at obtained on 2008 July 4. d) Subtraction between the on and off-filters revealing a source of He iiλ4686 and/or C iiiλ4650 line emission coincident with the explosion site of SN 2005at. All panels are 20 × 20 arcsec2 subsections of the images. The location of the SN is shown with a circle with a diameter of 1 arcsec. North is up and east is to the left in all the panels.
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