Definitions

• SCAN : raw observation of a source.
  Data written in nnnXXXXX.UIC files, with :
  nnn backend type (sao, nco, fil...)
  XXXXX SCAN NUMBER
  UIC TELESCOPE USER ID
  

  A SCAN includes some headers and several CYCLEs.
  

• CYCLE : Includes several PHASEs. A classical observation in position-switch mode would involve four phases :
  - one calibration phase (on source),
  - one ON source acquisition phase,
  - one calibration phase (off source),
  - one OFF source acquisition phase.
  Some peculiar telescope setup files may involve more phases.
  Each PHASE is made of several INTEGRATIONs.
  Each INTEGRATION contains 2 to 8 spectra, as the receiver may observe up to 4 frequencies, 1 to 4 polarization parameters

• What is NAPS doing ?