value unc_up unc_lo author ref method 6.14 0.200 0.200 Masiero 2014ApJ...791..121M NEATM 6.39 0.102 0.102 Masiero 2011ApJ...741...68M NEATM 6.64 0.152 0.152 Masiero 2011ApJ...741...68M NEATM