## Contents

- Rayleigh-Jeans or not Rayleigh-Jeans?
- Single-dish calibration in a nutshell
  - Description of the received signal
  - Description of the calibration scheme
- Description of ATM 2009
  - Atmospheric profile
  - (Sub-)mm radiative transfer
  - GILDAS interface
- Comparison of ATM 1985 and ATM 2009
  - Comparison of the implementation
  - Comparison at constant amount of water vapor
  - Comparison of the full calibration scheme
- Recommendations
- Acknowledgement
- Bibliography
- GILDAS fortran interfaces to ATM
- Comparison at constant amount of water vapor as a function of the frequency
- Effect of Earth curvature