value unc_up unc_lo author ref method 6.99 0.080 0.080 Masiero 2014ApJ...791..121M NEATM 7.79 0.440 0.440 Masiero 2012ApJ...759L...8M NEATM 7.91 0.141 0.141 Masiero 2011ApJ...741...68M NEATM