value unc_up unc_lo author ref method 3.97 0.176 0.176 Masiero 2011ApJ...741...68M NEATM 3.98 1.010 1.010 Nugent 2016AJ....152...63N NEATM 4.22 0.099 0.099 Masiero 2011ApJ...741...68M NEATM