Xiaolan Xu, Simon Yueh, Jet Propulsion Lab, California Institute of Technology, United States; Rashmi Shah, Jet Propulsion Laboratory, California Institute of Technology, United States; Charles Reynerson, Jet Propulsion Lab, California Institute of Technology, United States; Steve Margulis, University of California at Los Angeles, United States; Steve Franklin, Jet Propulsion Lab, California Institute of Technology, United States