value unc_up unc_lo author ref method 6.64 1.890 1.890 Nugent 2016AJ....152...63N NEATM 7.63 0.174 0.174 Masiero 2011ApJ...741...68M NEATM 7.65 0.289 0.289 Masiero 2011ApJ...741...68M NEATM