value	unc_up	unc_lo	author	ref	method
6.51	2.030	2.030	Nugent	2016AJ....152...63N	NEATM
6.74	0.254	0.254	Masiero	2011ApJ...741...68M	NEATM
6.80	nan	nan	Ali-Lagoa	2016A&A...591A..14A	NEATM