I stumbled across this today, I don't think this level of detail (as to spectra and Ni/Fe ratios in the particles) has been presented on the list before (but I could have missed it) http://ie.lbl.gov/mammoth/AGUSF_poster_2.gif Also, there's this: http://www.youtube.com/view_play_list?p=741568C2D58A9793