value unc_up unc_lo author ref method 3.40 0.040 0.040 Masiero 2014ApJ...791..121M NEATM 3.47 0.102 0.102 Masiero 2011ApJ...741...68M NEATM 3.61 0.032 0.032 Masiero 2011ApJ...741...68M NEATM