value unc_up unc_lo author ref method 7.47 0.310 0.310 Masiero 2012ApJ...759L...8M NEATM 7.76 0.070 0.070 Masiero 2014ApJ...791..121M NEATM 7.97 0.018 0.018 Masiero 2011ApJ...741...68M NEATM