value unc_up unc_lo author ref method 5.24 0.360 0.360 Masiero 2012ApJ...759L...8M NEATM 6.15 0.070 0.070 Masiero 2014ApJ...791..121M NEATM 6.69 0.084 0.084 Masiero 2011ApJ...741...68M NEATM