value unc_up unc_lo author ref method 4.36 0.150 0.150 Masiero 2014ApJ...791..121M NEATM 4.38 1.400 1.400 Masiero 2012ApJ...759L...8M NEATM 4.51 0.053 0.053 Masiero 2011ApJ...741...68M NEATM