value unc_up unc_lo author ref method 8.36 0.220 0.220 Masiero 2014ApJ...791..121M NEATM 8.51 0.200 0.200 Masiero 2012ApJ...759L...8M NEATM 9.10 0.264 0.264 Masiero 2011ApJ...741...68M NEATM