value unc_up unc_lo author ref method 5.08 0.310 0.310 Masiero 2012ApJ...759L...8M NEATM 5.94 0.090 0.090 Masiero 2014ApJ...791..121M NEATM 6.39 0.031 0.031 Masiero 2011ApJ...741...68M NEATM