Echelle Reduction

This Appendix describes the reduction of Echelle spectra. It describes the steps required to produce one-dimensional spectra from two-dimensional images. Operating procedures are described in detail so that this manual can be used as a guide by users without MIDAS experience.

A tutorial example is available in the system, the user is recommended to run it ( SET/CONTEXT echelle, then TUTORIAL/ECHELLE) while reading the relevant parts of this document. The algorithms related to the reduction method are described in Chapter .

• Input Data
• Auxiliary Data
• Starting the MIDAS Session
• Reading the Data
• Display and graphic windows
• On-line help
• A few useful commands
• Preprocessing
  • Bias correction
  • Dark-current and particle hits correction
  • Standard orientation
• Session Parameters
• The Reduction Session
  • Reduction using Standard Stars
    • Order Definition: Methods STD and COM
    • Order definition: Method Hough
    • Wavelength calibration
    • Background Correction
    • Flat Field correction
  • Reduction without Standard Star
• Saving the Data on Tape
• Instrument Description: CASPEC
• Summary of reduction options
• XEchelle
  • Graphical User Interface
    • Initializing Keywords
    • Short Help
    • Sending Commands
    • On-line HELP facility
    • Entering File Names
    • Dialog Windows
    • Saving and Loading Session Parameters
    • Performing Batch Reduction