value unc_up unc_lo author ref method 6.12 0.229 0.229 Masiero 2011ApJ...741...68M NEATM 6.67 0.037 0.037 Masiero 2011ApJ...741...68M NEATM 7.69 2.830 2.830 Masiero 2017AJ....154..168M NEATM