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CLASS
Continuum and Line Analysis Single-dish Software
A GILDAS software
November 21st, 2006
Version 1.1
Questions? Comments? Bug reports? Mail to: `gildas@iram.fr`
The GILDAS team welcomes an acknowledgement in publications
using GILDAS software to reduce and/or analyze data.
Please use the following reference in your publications:
`http://www.iram.fr/IRAMFR/GILDAS`

Documentation
  S.Bardeau, J. PetyIn charge: S.Bardeau, J. Pety.
  P. Hily-Blant, S. GuilloteauActive developers: P. Hily-Blant, S. Guilloteau.
  B. Delforge, T. Forveille, R. LucasMain past contributors: B. Delforge, T. Forveille, R. Lucas.
Software
  S.Bardeau, J. PetyIn charge: S.Bardeau, J. Pety.
  P. Hily-Blant, S. GuilloteauActive developers: P. Hily-Blant, S. Guilloteau.
  B. Delforge, T. Forveille, R. LucasMain past contributors: B. Delforge, T. Forveille, R. Lucas.

1. IRAM
2. Observatoire de Paris
3. Observatoire de Grenoble
4. Observatoire de Bordeaux

Note: this is the on-line version of the CLASS Manual. A PDF version is also available.

Related information is available in:

- GreG: Grenoble Graphics
- GILDAS: Grenoble Image and Line Data Analysis Software
- SIC: Simple Interpretor of Commands
- ASTRO: A Software To pRepare Observations

- Contents
- Introduction
- Cookbook
  - A `CLASS`ic Session
  - Reading a spectrum from a formatted input file
  - Exporting a spectrum to a formatted file
  - Building a Datacube from a CLASS File
  - Fitting an HyperFine Structure
    - Assumptions
    - Parameters of the multiplet
    - The fitting procedure
    - Typical Analysis Sequence
  - Subtracting Baseline on Large Datasets
  - Reading/Writing FITS file
    - Exporting CLASS Spectra through FITS
    - Importing FITS spectra into CLASS
- User manuel
  - Generalities
    - Data and Log Files
    - Observation and Version Number
    - Scan and Subscan Number
    - Entry Number and Index
    - R and T Memories
    - Large Set of Spectra
    - Variables
      - The Rope to Hang Yourself
      - Index Variables
      - Header Variables
      - Advanced Processing
  - Spectra Line Processing
    - Plotting Spectra
      - Single spectrum
      - Spectra map
      - Large set of spectra
    - Removing Baselines
    - Folding Frequency Switched Spectra
    - Adding Spectra
    - Analyzing profiles
    - Gridding Spectra on a 3-D Data Cube
    - Miscellaneous
  - Continuum and Skydip Processing
    - Continuum
    - Skydip Processing
  - Communication with the outer world
    - Listing Scientifically Valuable Results
    - Making Publishable Quality Figures
      - GREG functionalities
      - Bridge toward GREG functionalities
      - Annotations
    - Importing and Exporting Spectra From and To FITS
      - From FITS to CLASS
      - FITS Keyword redefinition
      - From CLASS to FITS
- Developer Manual (16-sep-2015)
  - Internal CLASS Format
    - Contents of one observation
    - File organization
    - File index
  - The Header and Data Sections
    - General Parameters
    - Position information
    - Spectroscopic information (for spectra)
    - Baseline information (for spectra or drifts)
    - Scan numbers of initial observations
    - Default plotting limits
    - Switching information (for spectra)
    - Calibration parameters
    - For Skydips observations. No associated data.
    - Gauss fit results (for spectra or drifts)
    - "Stellar shell" profile fit results (for spectra)
    - Hyperfine structure profile fit results (for spectra)
    - Hyperfine structure absorption profile fit results (for spectra)
    - Continuum drift description (for drifts)
    - Beam-switching parameters (for spectra or drifts)
    - Double gaussian and baseline fit results (for drifts)
    - Herschel Space Observatory (HIFI)
    - Comment Section
    - Data Section
  - Old OTF data format
    - Data Section Descriptor
    - Multiple spectra Data Section
  - CLASS FITS format
    - Simple SPECTRUM Mode
    - BINTABLE Mode
      - Known keywords
      - Known columns and data storage
    - Once FITS Always FITS
- Internal Helps
  - LAS Language Internal Help
    - Language
    - ACCUMULATE
      - ACCUMULATE /NOCHECK
      - ACCUMULATE /RESAMPLE
    - ASSOCIATE
    - AVERAGE
      - AVERAGE /NOCHECK
      - AVERAGE /RESAMPLE
    - BASE
    - BOX
    - CATALOG
      - CATALOG /SORT
    - CONSISTENCY
    - COPY
    - DROP
    - DUMP
    - EXTRACT
    - FILE
      - FILE IN
      - FILE OUT
      - FILE BOTH
      - FILE UPDATE
    - FIND
      - FIND APPEND
      - FIND NEW_DATA
      - FIND UPDATE
      - FIND /MASK
      - FIND /POSITION
    - FITS
      - FITS READ
      - FITS WRITE
    - FOLD
    - GET
    - HEADER
    - IGNORE
    - LIST
      - LIST /TOC
    - LOAD
    - MERGE
    - MODIFY
      - MODIFY BLANKING
      - MODIFY BANDS
      - MODIFY BEAM_EFF
      - MODIFY DOPPLER
      - MODIFY FREQUENCY
      - MODIFY ELEVATION_GAIN
      - MODIFY IMAGE
      - MODIFY LINENAME
      - MODIFY OFFSETS
      - MODIFY PARALLACTIC_ANGLE
      - MODIFY POSITION
      - MODIFY PROJECTION
      - MODIFY RECENTER
      - MODIFY SCALE
      - MODIFY SOURCE
      - MODIFY SYSTEM
      - MODIFY TELESCOPE
      - MODIFY VELOCITY
      - MODIFY WIDTH
      - MODIFY SWITCH_MODE
    - MULTIPLY
    - NEW_DATA
    - PLOT
    - SAVE
    - SET
      - SET ACTION
      - SET ALIGN
      - SET ANGLE
      - SET BAD
      - SET BASELINE
      - SET BOX
      - SET CALIBRATION
      - SET CHECK
      - SET DEFAULT
      - SET ENTRY
      - SET EXTENSION
      - SET FIND
      - SET FORMAT
      - SET FREQUENCY
      - SET LEVEL
      - SET LINE
      - SET MASK
      - SET MAP
      - SET MATCH
      - SET MODE
      - SET NOCHECK
      - SET NOMATCH
      - SET NUMBER
      - SET OBSERVATORY
      - SET OBSERVED
      - SET OFFSETS
      - SET PLOT
      - SET POSANGLE
      - SET PROCESSING
      - SET QUALITY
      - SET RANGE
      - SET REDUCED
      - SET SCALE
      - SET SCAN
      - SET SELECTION
      - SET SUBSCAN
      - SET SORT
      - SET SOURCE
      - SET SYSTEM
      - SET TELESCOPE
      - SET TYPE
      - SET UNIT
      - SET VARIABLE
      - SET VELOCITY
      - SET WEIGHT
      - SET WINDOW
    - SHOW
    - SPECTRUM
    - STITCH
      - STITCH /NOCHECK
      - STITCH /RESAMPLE
    - SWAP
    - TAG
    - TITLE
    - UPDATE
    - WRITE
  - ANALYSE Language Internal Help
    - Language
    - COMMENT
    - DIVIDE
    - DRAW
      - DRAW FILL
      - DRAW KILL
      - DRAW LOWER
      - DRAW MASK
      - DRAW MOLECULE
      - DRAW UPPER
      - DRAW TEXT
      - DRAW WINDOW
    - FFT
      - FFT /KILL
      - FFT /REMOVE
    - FILL
    - GREG
    - LMV
      - LMV FAXIS
    - MAP
      - MAP /GRID
      - MAP /CELL
      - MAP /NOLABEL
      - MAP /NUMBER
      - MAP /BASE
    - MEMORIZE
    - MODEL
    - NOISE
    - POPUP
    - PRINT
      - PRINT FIT
      - PRINT POINTING
    - REDUCE
    - RESAMPLE
      - RESAMPLE /FFT
      - RESAMPLE /LIKE
      - RESAMPLE SHAPE
    - RETRIEVE
    - SMOOTH
    - STAMP
      - STAMP /LABEL
    - STRIP
    - TABLE
      - TABLE /MATH
  - FIT Language Internal Help
    - Language
    - DISPLAY
    - ITERATE
      - ITERATE /NOCHECK
    - KEEP
    - LINES
    - METHOD
    - MINIMIZE
      - MINIMIZE GAUSSIAN
      - MINIMIZE SHELL
      - MINIMIZE HFS
      - MINIMIZE CONTINUUM
      - MINIMIZE /NOCHECK
    - RESIDUAL
    - RESULT
    - VISUALIZE
  - MAP Language Internal Help
    - Language
    - XY_MAP
      - XY_MAP /NOGRID
      - XY_MAP /TYPE
      - XY_MAP TUNING
      - XY_MAP MEMORY
  - DSB2SSB Language Internal Help
    - Language
    - INITIALIZE
    - DECONVOLVE
      - DECONVOLVE /GAIN
      - DECONVOLVE /KEEP
  - EXPERIMENTAL Language Internal Help
    - Language
    - DIFF
    - FILTER
    - MEDIAN
    - RMS
    - SUBTRACT
    - UNBLANK
    - UV_ZERO
    - VARIABLE
    - WAVELET
- Index
- About this document ...