value unc_up unc_lo author ref method 15.56 0.210 0.210 Masiero 2014ApJ...791..121M NEATM 17.27 0.219 0.219 Masiero 2011ApJ...741...68M NEATM 19.52 0.490 0.490 Masiero 2012ApJ...759L...8M NEATM