http://www.plosone.org/article/info:doi/10.1371/journal.pone.0010071 It's a great pity we aren't using torrent technology in our field... -- V. Balaji Office: +1-609-452-6516 Head, Modeling Systems Group, GFDL Home: +1-212-253-6662 Princeton University Email: v.balaji at noaa.gov