value unc_up unc_lo author ref method 7.53 0.510 0.510 Masiero 2012ApJ...759L...8M NEATM 7.87 0.060 0.060 Masiero 2014ApJ...791..121M NEATM 8.01 0.165 0.165 Masiero 2011ApJ...741...68M NEATM