value unc_up unc_lo author ref method 6.25 0.210 0.210 Masiero 2012ApJ...759L...8M NEATM 6.97 0.119 0.119 Masiero 2011ApJ...741...68M NEATM 7.33 1.980 1.980 Nugent 2016AJ....152...63N NEATM