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  • Package and Task Reference
    • dataio: Data format conversion package (RFITS, etc.)
    • images: General image processing package
    • language: The command language itself
    • lists: List processing package
    • obsolete: Obsolete tasks
    • noao: The NOAO optical astronomy packages
      • artdata: Artificial data generation package
      • astcat: Astronomical catalog and surveys access package
      • astutil: Astronomical utilities package
      • digiphot: Digital stellar photometry package
      • imred: Image reductions package
        • argus: CTIO ARGUS reduction package
        • bias: General bias subtraction tools
        • crutil: Tasks for detecting and removing cosmic rays
        • ccdred: Generic CCD reductions
        • ctioslit: CTIO spectrophotometric reduction package
        • dtoi: Density to Intensity reductions for photographic plates
        • echelle: Echelle spectral reductions (slit and FOE)
        • generic: Generic image reductions tools
        • hydra: KPNO HYDRA (and NESSIE) reduction package
        • iids: KPNO IIDS spectral reductions
        • irred: KPNO IR camera reductions
        • irs: KPNO IRS spectral reductions
        • kpnocoude: KPNO coude reduction package (slit and 3 fiber)
        • kpnoslit: KPNO low/moderate dispersion slits (Goldcam, RCspec, Whitecam)
        • quadred: CCD reductions for QUAD amplifier data
        • specred: Generic slit and fiber spectral reduction package
      • mtlocal: Magtape i/o for special NOAO format tapes
      • nobsolete: Obsolete tasks to be phased out in a future release
      • nproto: Prototype (temporary, contributed) tasks
      • observatory: Examine and define observatory parameters
      • obsutil: Observing utilities (planning or evaluation)
      • onedspec: One dimensional spectral red & analysis package
      • rv: Radial velocity analysis package
      • twodspec: Two dimensional spectral red & analysis package
    • plot: Plot package
    • proto: Prototype or interim tasks
    • softools: Software tools package
    • system: System utilities package
    • utilities: Miscellaneous utilities package
  • External packages
  • SPP Reference Manual
  • CL Programmer’s Manual
  • IRAF Standards and Conventions
  • Standard Nomenclature
  • Site Manager’s Guide
  • IRAF Release Notes
  • Additional IRAF documentation
  • PyRAF tutorial
IRAF
  • Package and Task Reference
  • noao: The NOAO optical astronomy packages
  • imred: Image reductions package
  • bias: General bias subtraction tools

bias: General bias subtraction tools

  • colbias: Fit and subtract an average column bias
  • linebias: Fit and subtract an average line bias
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