value	unc_up	unc_lo	author	ref	method
17.28	6.330	6.330	Nugent	2016AJ....152...63N	NEATM
18.57	0.061	0.061	Masiero	2011ApJ...741...68M	NEATM
19.67	1.700	1.700	Tedesco	2002AJ....123.1056T	STM