Fig. 4

Examples of very faint diffuse overdensities of different types found during our analysis: (i) giant stellar warps of a galactic disk(NGC 5506); (ii) a stellar ring with two seemingly interacting, partially disrupted cores embedded in it (NGC 2859); (iii) an image artifact resembling a giant satellite (NGC 3489); and (iv) extensive Galactic cirrus around NGC 7497. All these images have been processed with our technique, adapted from Miskolczi et al. (2011), using stacked SDSS g, r, an i band images, with a field of view of 30 arcmin. North is up, east to the left.
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