Detection of sector-like patterns in bacterial colonies. Grayscale images depicting the final state of two phase variation model simulations. Sector-like patterns corresponding to high-proportions of “mutant” cells are automatically detected and outlined in blue. Note that the colour scheme in these images is the inverse of the one in Figure 1A i.e. sector-like patterns are highlighted in white instead of black, respectively patches of wild-type cells are highlighted in black instead of white (gray). Moreover only one bacterial colony is depicted in each one of these images while in Figure 1A multiple bacterial colonies are shown.