value unc_up unc_lo author ref method 5.31 1.179 1.179 Masiero 2011ApJ...741...68M NEATM 5.47 1.777 1.777 Masiero 2011ApJ...741...68M NEATM 6.62 0.750 0.750 Masiero 2012ApJ...759L...8M NEATM