Xspec: An X-Ray Spectral Fitting Package

Version 12.14.1 Now Available

Helpful information available includes:

• Download and installation instructions
• Xspec release notes
• Getting Help
• Xspec internal functions guide
• Xspec facebook group [external]
• External Resources
• Historical Xspec information

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