value unc_up unc_lo author ref method 5.67 0.120 0.120 Masiero 2014ApJ...791..121M NEATM 6.12 0.092 0.092 Masiero 2011ApJ...741...68M NEATM 6.36 0.270 0.270 Masiero 2012ApJ...759L...8M NEATM