value unc_up unc_lo author ref method 15.43 0.276 0.276 Masiero 2011ApJ...741...68M NEATM 15.47 0.330 0.330 Masiero 2014ApJ...791..121M NEATM 16.23 7.130 7.130 Nugent 2016AJ....152...63N NEATM