value unc_up unc_lo author ref method 4.94 0.100 0.100 Masiero 2014ApJ...791..121M NEATM 5.19 0.250 0.250 Masiero 2012ApJ...759L...8M NEATM 6.77 0.014 0.014 Masiero 2011ApJ...741...68M NEATM