value unc_up unc_lo author ref method 6.12 0.410 0.410 Masiero 2012ApJ...759L...8M NEATM 6.54 0.060 0.060 Masiero 2014ApJ...791..121M NEATM 7.20 0.029 0.029 Masiero 2011ApJ...741...68M NEATM