value unc_up unc_lo author ref method 3.29 0.040 0.040 Masiero 2014ApJ...791..121M NEATM 3.40 0.014 0.014 Masiero 2011ApJ...741...68M NEATM 4.09 0.100 0.100 Masiero 2012ApJ...759L...8M NEATM