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xxxx Columns of the catalog xxxx
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1. no. of the source
2.  name of source
	as published in the referenced papers
3-4. equatorial coordinates (degree)
5-6. equatorial coordinates (hms, dms)
7-11. ugriz psf magnitudes from SDSS dr15 (1" search radius)
	(if empty -- no identification by sql database)
12-16. ugriz psf magnitude errors SDSS dr15 (1" search radius)
17. redshift
18. black hole mass (in solar mass)
19-21. source discovery/redshift/black hole mass reference
22. FIRST flux density (mJy, 1.5'' search radius)
	-1 not in the coverage
	* not detected, rms noise
23. NVSS flux density (mJy, 10'' search radius)
	only given if source is not in FIRST coverage
	-1 not in nvss coverage
	0 not detected
24. VLASS 1st epoch flux density (mJy, 1.5'' search radius; exceptions in col. 48. notes)
25. VLASS 2nd epoch flux density (mJy, 1.5'' search radius; exceptions in col. 48. notes)
26-42. VLBI flux densities from literature (various frequency bands)
	multiple observations/flux densities are noted in the given bands
43. VLBI flux density references
44. notes