value	unc_up	unc_lo	author	ref	method
2.0322e+18	1.7697e+18	1.7697e+18	Fienga	2013arXiv1301.1510F	Ephem
4.9019e+17	2.0584e+17	2.0584e+17	Fienga	INPOP19a	Ephem
7.7800e+17	nan	nan	Folkner	2014IPNPR.196C...1F	Ephem