value unc_up unc_lo author ref method 5.46 0.233 0.233 Masiero 2011ApJ...741...68M NEATM 6.27 1.900 1.900 Masiero 2012ApJ...759L...8M NEATM 6.59 2.000 2.000 Nugent 2016AJ....152...63N NEATM