Fig. 2From: Microbial community compositions in different functional zones of Carrousel oxidation ditch system for domestic wastewater treatmentHeat map to profile the most abundant genera (top50) of the anaerobic-(A1), anoxic-(A2) and oxic-(O) zones in each WWTP. The color bar indicates the range of the percentage of a genus in a sample, based on the color key (log scale) at the top right Back to article page