value unc_up unc_lo author ref method 6.42 1.260 1.260 Nugent 2016AJ....152...63N NEATM 7.25 1.085 1.085 Masiero 2011ApJ...741...68M NEATM 7.37 0.247 0.247 Masiero 2011ApJ...741...68M NEATM