value unc_up unc_lo author ref method 3.76 0.250 0.250 Masiero 2014ApJ...791..121M NEATM 4.29 0.080 0.080 Masiero 2012ApJ...759L...8M NEATM 4.44 0.060 0.060 Masiero 2011ApJ...741...68M NEATM