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  A deep Chandra ACIS survey of M51 (Kuntz+, 2016)
Post annotation
1.J/ApJ/827/46/table2Chandra observations (12 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)
  ObsID  Chandra observation ID (;obs)
  obs s (n)UT date of the observation (time.epoch;obs)
  Epoch (char) Major epoch (time.epoch)
  Exp ks [9.6/190] Exposure time (time.duration;obs.exposure)
  Roll deg Roll angle (instr.offset)
  Mode (char) Mode (instr.setup)

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