Table 3: Standard space physics coordinate systems from Russell (1971), Hapgood (1992), and Fränz & Harper (2002), together with their associated WCS labels for CTYPEi declarations.

Coordinate system	Abbrev.	WCS labels
Geocentric equatorial inertial	GEI	GEIX, GEIY, GEIZ
Geographic	GEO	GEOX, GEOY, GEOZ
Geocentric solar ecliptic	GSE	GSEX, GSEY, GSEZ
Geocentric solar magnetic	GSM	GSMX, GSMY, GSMZ
Solar magnetic	SM	SM_X, SM_Y, SM_Z
Geomagnetic	MAG	MAGX, MAGY, MAGZ
Helicentric Aries Ecliptic	HAE	HAEX, HAEY, HAEZ
Heliocentric Earth Ecliptic	HEE	HEEX, HEEY, HEEZ
Heliocentric Earth Equatorial	HEEQ	HEQX, HEQY, HEQZ
Heliocentric Intertial	HCI	HCIX, HCIY, HCIZ