Hanna G Sizemore, Planetary Science Institute Tucson, Tucson, AZ, United States, Vera Demchenko, University of Colorado at Boulder, Boulder, United States, Rachel Slank, University of Arkansas, Fayetteville, AR, United States, Aaron Zent, NASA Ames Research Center, Moffett Field, CA, United States, Alan W Rempel, University of Oregon, Eugene, OR, United States and David E Stillman, Southwest Research Institute, Boulder, CO, United States