value unc_up unc_lo author ref method 6.43 0.217 0.217 Masiero 2011ApJ...741...68M NEATM 7.71 0.170 0.170 Masiero 2012ApJ...759L...8M NEATM 8.36 2.140 2.140 Nugent 2016AJ....152...63N NEATM