value unc_up unc_lo author ref method 3.89 0.180 0.180 Masiero 2012ApJ...759L...8M NEATM 4.49 0.150 0.150 Masiero 2014ApJ...791..121M NEATM 4.73 0.113 0.113 Masiero 2011ApJ...741...68M NEATM