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We thank Igor Ravve, three anonymous reviewers, and the associate editor Jörg Schleicher for constructive suggestions that improved the paper.

Partial funding for this project was provided by RPSEA through the “Ultra-Deepwater and Unconventional Natural Gas and Other Petroleum Resource” program authorized by the US Energy Policy Act of 2005. RPSEA ( is a nonprofit corporation whose mission is to provide a stewardship role in ensuring the focused research, development and deployment of safe and environmentally responsible technology that can effectively deliver hydrocarbons from domestic resources to the citizens of the United States. RPSEA, operating as a consortium of premier US energy research universities, industry, and independent research organizations, manages the program under a contract with the US Department of Energy's National Energy Technology Laboratory.