Which are the main clusters? In our example network it is easy to identify three main clusters at the top (A), at the bottom right (B) and at the bottom left (C). The clusters A and B are the largest and the easiest to identify. The cluster C is smaller and does not contain more nodes than the plurality of smaller sub-clusters scattered through the graph. The cluster C, however, is clearly distinguished from A and B and occupies its own space. This is why we count it as one of the main cluster of the network. The triangular shape of our network is thus the result of the three main clusters pulling in three different directions.