Sensitivity and F-score values for flat multi-class classification. For each Bacillus species, the corresponding sensitivity and F-score value of flat multi-class classification is displayed along the 16S rRNA gene NJ tree. Sensitivity is indicated by the light blue bars, F-score by the green bars. The tree is visualized using the iTol webtool . The Bacillus cereus and Bacillus subtilis groups are coloured in blue and green, respectively.