value unc_up unc_lo author ref method 6.20 1.860 1.860 Masiero 2020PSJ.....1....5M NEATM 8.17 0.063 0.063 Masiero 2011ApJ...741...68M NEATM 8.30 2.440 2.440 Masiero 2012ApJ...759L...8M NEATM