Skip to main content

NASA | GSFC | Sciences and Exploration

HEASARC

High Energy Astrophysics Science Archive Research Center

Menu

• HEASARC
  • About
  • Help Desk
  • Upcoming Meetings
  • Archive Your Data
  • Archive Statistics
  • LAMBDA Portal
• Observatories
  • Observatories
  • Active Missions
  • Past Missions
  • Upcoming Missions
  • Comparison
• Archive
  • Archive
  • Search Portal
  • Search APIs
  • Cloud
  • SciServer
  • FTP Area
• Calibration
  • Calibration
  • Remote Access
  • Documentation
  • Keywords
  • Cross Calibration
  • Supported Missions
• Software
  • Software
  • HEASoft
  • FITSIO
  • Xspec
  • Xronos
  • Ximage
  • XSTAR
• Web Tools
  • Web Tools
  • WebPIMMS
  • WebSpec
  • Viewing Tool
  • nH Calculator
  • Coordinates Converter
  • Time Converter
  • SkyView
• Help & Support
  • Help Desk
  • Proposal Submission
  • Bibliography
  • Resources for Scientists
  • FAQ
  • Outreach

• About
• Sitemap
• Help Desk
• Archive Your Data

Search

Come analyze HEASARC, IRSA, and MAST data in the cloud! The Fornax Initiative is now welcoming all interested beta users.

Xspec Home Page

Statistics in XSPEC

Return to top

• HEASARC
• Observatories
• Archive
• Calibration
• Software
• Web Tools
• Help & Support

• About NASA
• Accessibility
• FOIA

• No FEAR Act
• Privacy Policy
• Vulnerability Disclosure Policy

• Responsible Official: Ryan Smallcomb
• Site Editor: Kristen Killingsworth
• Last Updated: 13-Aug-2026

A service of the Astrophysics Science Division at NASA/GSFC