value unc_up unc_lo author ref method 6.03 0.050 0.050 Masiero 2014ApJ...791..121M NEATM 6.22 0.230 0.230 Masiero 2012ApJ...759L...8M NEATM 6.38 0.025 0.025 Masiero 2011ApJ...741...68M NEATM