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There are currently 6 such files:
- AA2014_ubvri—Astronomical Almanac for 2014 list of UBVI standards (section H), which is basically the list from Landolt (2009).
- clem07—Clem, Vandenberg, & Stetson (2007): Secondary standard stars for the u’g’r’i’z’ photometric system.
- clem13—Clem & Landolt (2013): Faint UBVRI standard star fields
- hbstand—Farnham, Schleicher, & A’Hearn (2000), The HB narrow band comet filters: standard stars and calibration.
- landolt09—Landolt (2009): UBVRI photometric standards around the celestial equator.
- landolt92—Landolt (1992): UBVRI photometric standard stars in the Magnitude Range 11.5 < V < 16.0 around the celestial equator.
More and more may be added soon. Some of these file contain many thousands of sources and take quite a long time to load.