value unc_up unc_lo author ref method 5.19 1.130 1.130 Nugent 2016AJ....152...63N NEATM 6.23 0.440 0.440 Masiero 2012ApJ...759L...8M NEATM 6.63 0.360 0.360 Masiero 2012ApJ...759L...8M NEATM