Out-degree and in-degree of three banks. Out-degree (left panel) and in-degree (right panels) of banks labeled as B10005 (a city bank), B10008, and B10015 in the database. B10008 was the bank the Sanwa Bank from 1980 to 2002 when it became the UFJ Bank Ltd until 2006. B10015 was the Bank of Tokyo from 1980 to 1996 when it merged with Mitsubishi Bank. B10005 code refers to Mitsubishi Bank from 1980 to 1996, to Bank of Tokyo - Mitsubishi Bank from 1996 to 2006 and to Bank of Tokyo - Mitsubishi - UFJ bank from 2006 to 2011.