value unc_up unc_lo author ref method 4.20 0.060 0.060 Masiero 2014ApJ...791..121M NEATM 4.49 0.023 0.023 Masiero 2011ApJ...741...68M NEATM 4.88 0.140 0.140 Masiero 2012ApJ...759L...8M NEATM