value unc_up unc_lo author ref method 15.93 0.213 0.213 Masiero 2011ApJ...741...68M NEATM 17.63 0.246 0.246 Masiero 2011ApJ...741...68M NEATM 17.90 5.980 5.980 Nugent 2016AJ....152...63N NEATM 20.24 6.210 6.210 Nugent 2016AJ....152...63N NEATM