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  UBV photometry of early-type stars (Mayer+, 2010)
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1.J/AN/331/274/standardMeasurements of standard stars (34 rows)

Query by Constraints constraints help applied on Columns (Output Order: + - )
ShowSortColumn  Constraint Explain   (UCD)
  recno  Record number assigned by the VizieR team. Should Not be used for identification. (meta.record)
  Name (char) HD or BD name (
  Sys (char) Gr - standard by Graham, La - by Landolt (;meta.dataset)
  Vmagl mag V according to Gr or La (phot.mag;em.opt.V)
  B-Vl mag B-V according to Gr or La (phot.color;em.opt.B;em.opt.V)
  U-Bl mag U-B according to Gr or La (phot.color;em.opt.U;em.opt.B)
  Vmag mag Observed value of V (phot.mag;em.opt.V)
  B-V mag Observed value of B-V (phot.color;em.opt.B;em.opt.V)
  U-B mag Observed value of U-B (phot.color;em.opt.U;em.opt.B)
  nMeas  Number of measurements (meta.number)
  Note  (n) [1/13] Note (Note 1)   (meta.note)
  Simbad  ask the Simbad data-base about this object

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(n) indicates a possible blank or NULL column(i)indexed column
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