value unc_up unc_lo author ref method 6.00 0.584 0.584 Masiero 2011ApJ...741...68M NEATM 6.41 1.305 1.305 Masiero 2017AJ....154..168M NEATM 6.70 0.207 0.207 Masiero 2011ApJ...741...68M NEATM