E. Tilton, M. Stevans, J. Shull, and C. Danforth. (2015)cite arxiv:1512.02635Comment: 15 pages, 9 figures, 4 tables. Accepted to the Astrophysical Journal.
S. Wyithe, A. Loeb, and P. Oesch. (2013)cite arxiv:1308.2030Comment: 12 pages, 8 figures. Submitted to MNRAS. arXiv admin note: substantial text overlap with arXiv:1209.2215.