value unc_up unc_lo author ref method 6.41 0.136 0.136 Masiero 2011ApJ...741...68M NEATM 6.97 1.890 1.890 Nugent 2016AJ....152...63N NEATM 7.07 1.440 1.440 Masiero 2012ApJ...759L...8M NEATM