value unc_up unc_lo author ref method 3.85 0.177 0.177 Masiero 2011ApJ...741...68M NEATM 4.00 0.260 0.260 Masiero 2012ApJ...759L...8M NEATM 4.55 0.252 0.252 Masiero 2011ApJ...741...68M NEATM