False positives. Examples of sources that appear as LSB galaxies in the MTO detection but have different physical natures. The left panels show color images generated from the FDS data, and the right panels show the segmentation maps, where different object labels are shown with different colors. The two upper examples show groups of galaxies that are connected on low SB levels and where the common LSB envelope is associated with one of the galaxies, making its mean SB low. The two lower panels show reflection rings around bright stars. Those objects have similar SBs as LSB dwarfs.