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 VizieR META catalogue
Describes the Catalogues and Tables accessible via VizieR (also called ReferenceDirectory)
Post annotation
1.METAhitPopularity of catalog on time/host

Query by Constraints constraints help applied on Columns (Output Order: + - )
ShowSortColumn  Constraint Explain   (UCD)
  catid  table identification as in METAtab (meta.code;meta.dataset)
  hstid  Host Identifier, FK(METAhst) (meta.code;meta.dataset)
  btime  Date/time (sec/2000) of period start (time.epoch;stat.min)
  etime  Date/time (sec/2000) of period end (time.epoch;stat.max)
  Ncalls  Number of calls in the period (meta.number)
  n2list  number of list calls (meta.number)

ALL cols
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usage  Display UCD1+    UCD1  
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