value unc_up unc_lo author ref method 8.31 1.140 1.140 Masiero 2012ApJ...759L...8M NEATM 8.59 0.220 0.220 Masiero 2014ApJ...791..121M NEATM 8.78 0.053 0.053 Masiero 2011ApJ...741...68M NEATM