Left: Isodensity contour plot in average surface brightness versus apparent magnitude space for the visually identified dwarf galaxy candidates in the reference tile 102158889 with a score ≥0.8. The dwarf candidate sample was manually cleaned to ensure good MER photometry of the sources. The upper portion of the outermost contour is used as basis for the subsequent automated selection cut (right). The non-dwarf galaxies (POINT_LIKE_PROB < 0.8; grey points) and stars (POINT_LIKE_PROB ≥ 0.8; pink points) are also included for reference. Right: Example of the automatic selection cut in the reference tile. We slightly extended the upper portion of the outer density contour (red) to select the few bright dwarf candidates with score ≥0.8 that would otherwise have been missed. The final selection cut is shown in orange. Many of the less confident dwarfs (score < 0.8) are also selected by this line.