value unc_up unc_lo author ref method 3.55 0.160 0.160 Masiero 2012ApJ...759L...8M NEATM 3.77 0.050 0.050 Masiero 2014ApJ...791..121M NEATM 4.17 0.043 0.043 Masiero 2011ApJ...741...68M NEATM