value unc_up unc_lo author ref method 8.45 0.130 0.130 Masiero 2014ApJ...791..121M NEATM 8.49 0.093 0.093 Masiero 2011ApJ...741...68M NEATM 8.63 0.800 0.800 Masiero 2012ApJ...759L...8M NEATM