value unc_up unc_lo author ref method 13.91 4.080 4.080 Nugent 2016AJ....152...63N NEATM 15.80 0.119 0.119 Masiero 2011ApJ...741...68M NEATM 16.16 0.250 0.250 Masiero 2012ApJ...759L...8M NEATM