value unc_up unc_lo author ref method 6.92 0.100 0.100 Masiero 2014ApJ...791..121M NEATM 7.29 0.240 0.240 Masiero 2012ApJ...759L...8M NEATM 7.48 0.092 0.092 Masiero 2011ApJ...741...68M NEATM