# Cookbook

This part is a list of recipes enabling the beginner or the occasional user the get on the air very quickly, without losing his time searching the system's on-line HELP facility.

Subsections

- A CLASSic 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