value unc_up unc_lo author ref method 7.95 0.195 0.195 Masiero 2011ApJ...741...68M NEATM 8.06 0.250 0.250 Masiero 2014ApJ...791..121M NEATM 8.10 0.180 0.180 Masiero 2011ApJ...741...68M NEATM