http://arxiv.org/abs/1207.7139 http://arxiv.org/abs/1207.7139 Based on this analysis, not much. But then again, the estimation methods in the paper are not ver

http://arxiv.org/abs/1207.7139 http://arxiv.org/abs/1207.7139 Based on this analysis, not much. But then again, the estimation methods in the paper are not very good IMHO.