value unc_up unc_lo author ref method 10.21 3.330 3.330 Masiero 2012ApJ...759L...8M NEATM 10.27 3.255 3.255 Masiero 2017AJ....154..168M NEATM 9.11 0.112 0.112 Masiero 2011ApJ...741...68M NEATM