value unc_up unc_lo author ref method 4.92 0.990 0.990 Nugent 2016AJ....152...63N NEATM 5.90 0.189 0.189 Masiero 2011ApJ...741...68M NEATM 6.35 1.920 1.920 Masiero 2012ApJ...759L...8M NEATM