value unc_up unc_lo author ref method 6.18 0.100 0.100 Masiero 2014ApJ...791..121M NEATM 6.24 0.100 0.100 Masiero 2014ApJ...791..121M NEATM 6.30 0.119 0.119 Masiero 2011ApJ...741...68M NEATM 6.52 0.056 0.056 Masiero 2011ApJ...741...68M NEATM