value unc_up unc_lo author ref method 6.75 0.630 0.630 Masiero 2012ApJ...759L...8M NEATM 7.33 0.170 0.170 Masiero 2014ApJ...791..121M NEATM 7.49 0.148 0.148 Masiero 2011ApJ...741...68M NEATM