I am trying to interpret the figure that is plotted by syntenet (https://github.com/almeidasilvaf/syntenet) that visualizes the phylogenomic profiles for the different species and groups; What exactly are the different colors corresponding to increasing numbers (e.g. red color -> +3)? In addition what does the clustering tree on top of the figure represent? Are these groups of clusters that are shared in different species? Some more infor in the documentation would help.