value unc_up unc_lo author ref method 6.86 0.140 0.140 Masiero 2012ApJ...759L...8M NEATM 7.15 0.100 0.100 Masiero 2014ApJ...791..121M NEATM 7.82 0.073 0.073 Masiero 2011ApJ...741...68M NEATM