value unc_up unc_lo author ref method 6.10 0.030 0.030 Masiero 2014ApJ...791..121M NEATM 6.21 0.091 0.091 Masiero 2011ApJ...741...68M NEATM 6.95 0.170 0.170 Masiero 2012ApJ...759L...8M NEATM