value unc_up unc_lo author ref method 5.27 0.260 0.260 Masiero 2012ApJ...759L...8M NEATM 5.56 0.100 0.100 Masiero 2014ApJ...791..121M NEATM 6.00 0.029 0.029 Masiero 2011ApJ...741...68M NEATM