D. Brisbin, and M. Harwit. (2011)cite arxiv:1110.5862
Comment: 27 pages plus bibliography 4 figures 3 supplementary online figures
ascii data tables available.
M. Krumholz, and A. Dekel. (2011)cite arxiv:1106.0301Comment: 21 pages, 17 figures, emulateapj format, submitted to ApJ. Resolution of some figures degraded to fit within arXiv size limits. A full resolution version is available at http://www.ucolick.org/~krumholz/publications.html.