Xspec
An X-Ray Spectral Fitting Package
Downloads Manual Issues/Patches Additional Models Xspec In Python
  (Updated 07/02/14) (Updated 07/07/14)    


New Version 12.8.2 Now Available!
See the release notes for the many new enhancements

User's Guide for version 12.8.2

Helpful information available includes:

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Frequently Asked Questions

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Link to download and install instructions page

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XSPEC v12.8.2 release notes

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XSPEC wiki

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Keith's xspector blog

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xspec facebook group

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Xspec v11 Manual The final version of the manual for v11.

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v12 versus v11 A page comparing the design and capabilities of the new and old versions.

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Details of XSPEC redesign A site section displaying the design details and implementation of the new XSPEC version 12.

For an overview of the redesign project, see Redesign & Reimplementation of XSPEC Dorman, Ben & Arnaud, K. A. 2001 in Astronomical Data Analysis Software and Systems X, ASP Conference Proceedings, Vol. 238. Edited by F. R. Harnden, Jr., Francis A. Primini, and Harry E. Payne. San Francisco: Astronomical Society of the Pacific, p.415


Download the full XSPEC v12.8.2 manual.

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Manual in Portable Document Format (PDF)
Adobe Acrobat (link to free download for reader)

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Manual in HTML format

The latest XSPEC reference is ... Arnaud, K.A., 1996, Astronomical Data Analysis Software and Systems V, eds. Jacoby G. and Barnes J., p17, ASP Conf. Series volume 101.


Xspec 12 was developed by Keith Arnaud, Ben Dorman, and Craig Gordon,

HEASARC Software Development, Astrophysics Science Divsion,

Code 660.1, NASA/GSFC, Greenbelt MD 20771

Please send comments, questions, and bug reports to xspec12@athena.gsfc.nasa.gov

Xanadu Home Page Xanadu ftp site


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Last modified: Monday, 07-Jul-2014 17:11:24 EDT