1. a NASA Goddard Space Flight Center , Science Systems and Applications Inc. , Code 913, Greenbelt, MD, 20771, USA
2. b Laboratory for Atmospheres , NASA Goddard Space Flight Center , Code 913, Greenbelt, MD, 20771, USA
3. c Canada Centre for Remote Sensing , Natural Resources Canada , 588 Booth St., Ontario, K1A OY7, Canada