FDR networks for 1984 and 2009. Statistically validated FDR networks for the calendar years 1984 (left) and 2009 (right). Banks are shown as squares and firms as red circles. Banks labeled by the Cyan color are City Banks whereas all the other banks are labeled as Blue. Arcs are starting from the node performing the statistical validation. A number of bidirectional arcs are observed (25 in 1984 and 9 in 2009).