value unc_up unc_lo author ref method 6.89 0.460 0.460 Masiero 2012ApJ...759L...8M NEATM 7.28 0.100 0.100 Masiero 2014ApJ...791..121M NEATM 7.50 0.063 0.063 Masiero 2011ApJ...741...68M NEATM