Chord diagram of the features derived in Experiment DR7+9. Every feature is associated to a specific colour, and starting from the first feature A it is possible to follow all the possible paths of the tree, depicting the different feature subsets. Ordered from outside to inside, the external arcs represent the occurrences of a particular feature: the total percentage of the individual connections, the numbers and sources of connections entering, and the numbers and targets of connections exiting. (Note the branches splitting in feature C and re-joining in feature F).