value unc_up unc_lo author ref method 7.37 0.170 0.170 Masiero 2014ApJ...791..121M NEATM 7.72 0.061 0.061 Masiero 2011ApJ...741...68M NEATM 8.58 1.900 1.900 Nugent 2016AJ....152...63N NEATM