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Iraf guide A Beginner ? s Guide to Using IRAF IRAF Version Jeannette Barnes Central Computer Services National Optical Astronomy Observatories ?? ?? Tucson Arizona August ABSTRACT IRAF is a general Image Reduction and Analysis Facility providing a wide ra

A Beginner ? s Guide to Using IRAF IRAF Version Jeannette Barnes Central Computer Services National Optical Astronomy Observatories ?? ?? Tucson Arizona August ABSTRACT IRAF is a general Image Reduction and Analysis Facility providing a wide range of image processing tools for the user IRAF is a product of the National Optical Astronomy Observatories and was developed for the astronomical community although researchers in other scienti ?c ?elds have found IRAF to be useful for general image processing This document is intended to provide the novice user with a brief introduction to IRAF and its Command Language CL user interface The author would like to thank the members of the IRAF group for comments and suggestions during the preparation of this document DRAFT ?? ??Operated by the Association of Universities for Research in Astronomy Inc under cooperative agreement with the National Science Foundation C CCONTENTS Introduction Overview Getting IRAF Documentation IRAF support services Style conventions Getting started Host startup ?les IRAF startup ?les Logging in out of IRAF The basics Setting up your IRAF environment De ?ning your terminal type Selecting hard copy devices Choosing an editor Packages and tasks General help facilities Simple tools Online manual pages The HELP task The PHELP task Printing online manual pages Finding a task with a particular function REFERENCES Doing things with directories Creating removing directories Changing directories Parameter ?les Listing parameters Editing parameters Resetting task parameters Executing tasks General syntax Running tasks in the background Aborting tasks Data ?les C IRAF image ?les The IRAF image header The IRAF pixel ?le Pixel data types Image dimensions General image tools Reading and writing data General tape handling facilities Setting tape densities FITS facilities Reading FITS images Writing FITS images Text ?les Non-standard data formats Tar ?le format Miscellaneous I O tasks Plotting data Interactive graphics cursor mode One-dimensional vector plotting tasks Two- dimensional plotting tasks Tasks that manipulate graphics metacode ?les Using the image display Displaying IRAF images Using the interactive image cursor Reading the image cursor position Examining and editing images Coordinate systems within IRAF Additional interesting topics Input output redirection Image sections File and image name templates The ?le History and command logging Using the CL as a calculator IRAF networking Syntax The irafhosts ?le C Writing your own software Writing IRAF scripts The IMFORT interface Programming in IRAF with SPP Appendix A The IRAF Packages Appendix B The NOAO Packages Appendix C IRAF Image Formats Appendix D Fixing Pixel File Pathnames Appendix E The IRAF Network Archive Appendix F IRAF Layered Packages Appendix G A Selected List of IRAF Documentation C CA Beginner ? s Guide to Using IRAF IRAF Version Jeannette Barnes Central Computer Services National Optical Astronomy Observatories ?? ?? Tucson Arizona August Introduction Overview IRAF is a general Image Reduction and Analysis Facility providing a wide range of image processing tools for the user IRAF is a product of the National Optical Astronomy Observatories NOAO and was developed for the astronomical community although researchers in other