value unc_up unc_lo author ref method 2.44 0.465 0.465 Masiero 2011ApJ...741...68M NEATM 3.19 0.170 0.170 Masiero 2012ApJ...759L...8M NEATM 3.28 0.225 0.225 Masiero 2011ApJ...741...68M NEATM