Before revision:  They serve as proxies for measuring the interdependence of financial markets and the robustness of the global financial system from 2002 to 2012, covering the 2008 global financial crisis.
After revision:  They serve as network-proxies for measuring the interdependence of financial markets and the robustness of the global financial system from 2002 to 2012, covering the 2008 global financial crisis.