Contents

• List of Tables
• List of Figures
• Introduction
• Description of the Instrument
• How the instrument works
  • Extended mode of Operations (3.3, page 7).
• Overview of modes of operation
  • Rapid scanning (4.4, page 9).
• Performance of the instrument
  • Measured Performance (5.3, page 11)
    • Transmission Efficiency (5.3.1., page 11)
    • Spectral resolution (5.3.2., page 12)
    • Photometric Sensitivity (5.3.3, page 12)
  • Detector ramps
  • Beam Width
  • Fringing
• Cookery Book
  • Recommendations for LWS Observers
    • Beam Width
    • Deglitching
    • Fringing
  • Overheads
  • Sensitivities in Medium Resolution mode
  • Sensitivity in High Resolution mode
  • The possible ramp lengths
  • The maximum Signal to Noise per ramp
  • How to estimate observing times
    • Calculation of S/N per ramp
    • Calculation of number of ramps
    • Calculation of the required integration time
    • Calculation of the number of points in the scan
    • Calculation of the required integration time for the observation
    • Calculation of the TDT
  • Worked examples
    • Grating line scan
    • FP line scan