CSC 2.1–SDSS Primary Crossmatch Column Descriptions

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	Column Name	Class	Units	Description
1	Field	short		CSC2 Ensemble number
2	CSC_SrcName	string		CSC2 master source name, 2CXO JHHMMSS.s+DDMMSS (name)
3	CSC_SrcType	string		CSC2 source type (P[oint] or X[tended])
4	CSC_RA	double	deg	CSC2 source right ascension
5	CSC_DEC	double	deg	CSC2 source declination
6	CSC_ErrMaj	float	arcsec	CSC2 semi major axis of 1σ error ellipse
7	CSC_ErrMin	float	arcsec	CSC2 semi minor axis of 1σ error ellipse
8	CSC_ErrPa	float	deg	CSC2 position angle of 1σ error ellipse
9	CSC_RawMaj	float	arcsec	CSC2 semi major axis of 1σ PSF or raw ellipse
10	CSC_RawMin	float	arcsec	CSC2 semi minor axis of 1σ PSF or raw ellipse
11	CSC_RawPa	float	deg	CSC2 position angle of 1σ PSF or raw ellipse
12	SDSS_SrcName	string		SDSS DR18 name
13	SDSS_SrcType	string		SDSS source type classification (S for stars, G for galaxies)
14	SDSS_RA	double	deg	SDSS DR18 right ascension
15	SDSS_DEC	double	deg	SDSS DR18 declination
16	SDSS_ErrMaj	float	arcsec	SDSS DR18 semi major axis of 1σ error ellipse
17	SDSS_ErrMin	float	arcsec	SDSS DR18 semi minor axis of 1σ error ellipse
18	SDSS_ErrPa	float	deg	SDSS DR18 position angle of 1σ error ellipse
19	SDSS_RawMaj	float	arcsec	SDSS DR18 semi major axis of 1σ PSF or raw size ellipse
20	SDSS_RawMin	float	arcsec	SDSS DR18 semi minor axis of 1σ PSF or raw size ellipse
21	SDSS_RawPa	float	deg	SDSS DR18 position angle of 1σ PSF or raw size ellipse
22	MatchClass	string		Match class (d, l, c, k, r, a)
23	BFType	string		BF type (e[rror ellipse] or r[aw size])
24	MatchProb	float		Match probability
25	Separation	float	arcsec	CSC2–SDSS DR18 separation
26	NormSep	float		Normalized separation (separation/match σ)

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