Dust-corrected central region of the observed SDSS r-band image. The correction was only applied within a major axis radius of 80″ (see caption of Fig. A.1). The over-plotted color coding indicates the degree of the correction where 0.1 means that the observed flux increased by 10%. The lines in the center of the image are edge artifacts from assembling the single SDSS images to a large FOV montage.