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Wavelength calibration of GMOS is obtained using GCAL, the facility calibration unit. Flat-fielding is done with GCAL or on the sky during twilight. Baseline calibrations will be obtained for all observations, both queue and classical.


  • Baseline Calibrations
  • GCAL
  • Flat/Arc Configuration and Exposure Times
  • Photometric Standards
  • Spectroscopic Standards
  • Lick Index Standards
  • Examples: CuAr arcs (with line wavelengths indicated), flats, biases
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