value unc_up unc_lo author ref method 6.32 0.230 0.230 Masiero 2012ApJ...759L...8M NEATM 6.50 1.590 1.590 Nugent 2016AJ....152...63N NEATM 7.08 0.056 0.056 Masiero 2011ApJ...741...68M NEATM