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AAS        American Astronomical Society
ADF        Astrophysics Data Facility
ANSI       American National Standards Institute
Astro-E    Fifth Japanese X-ray Astronomy Satellite
ASCA       Advanced Satellite for Cosmology and Astrophysics (formerly Astro-D)
AXAF       Advanced X-ray Astrophysics Facility
BBXRT      Broad Band X-Ray Telescope
BeppoSAX   Beppo (Occhialini) Satellite Italiano per Astronomia X
CFITSIO    C FITS Input/Output Software
CGRO       Compton Gamma Ray Observatory (or Compton Observatory)
COSSC      Compton Observatory Science Support Center
DSN        Deep Space Network
EUVE       Extreme Ultraviolet Explorer
EXOSAT     European X-ray Observatory Satellite
FITS       Flexible Image Transport System
FOV        Field of view
GIS        Gas Imaging Spectrometer (ASCA)
GOF        Guest Observer Facility
GRASP      Generic Retrieval/Archive Services Protocol
GSFC       Goddard Space Flight Center
GTI        Good Time Interval
GUI        Graphical User Interface
HEAD       High Energy Astrophysics Division (of the AAS)
HEAO       High Energy Astrophysics Observatory
HEASARC    High Energy Astrophysics Science Archive Research Center
HK         House Keeping Data
HRI        High-Resolution Imager (Einstein and ROSAT)
HUG        HEASARC Users Group
IDL        Interactive Data Language
IMH        Image Header (IRAF file format)
IRAF       NOAO's Image Reduction and Analysis Facility
LHEA       Laboratory for High Energy Astrophysics
LMXB       Low-Mass X-Ray Binary
MIT        Massachusetts Institute of Technology
MPE        Planck Institut für Extraterrestrische Physik
NSSDC      National Space Science Data Center
OGIP       Office for Guest Investigator Programs
PIMMS      Portable Interactive Multi-Mission Software
PSPC       Position-Sensitive Proportional Counter (ROSAT)
QPOE       Quick Position Oriented Events (IRAF file format)
RDB        Relational Database
RFITS      Rationalized FITS format (ROSAT)
ROSAT      Röntgensatellit
RXTE       Rossi X-ray Timing Explorer
SAA        South Atlantic Anomaly
SIS        Solid-state Imaging Spectrometer (ASCA)
SOF        Science Operations Facility
Tcl/Tk     Tool Command Language/Tool Kit (a scripting language)
USRSDC     US ROSAT Science Data Center
XANADU     Analysis system containing XSPEC, XRONOS, XIMAGE and QDP
XMM        X-ray Multi-Mirror Observatory
XSPEC      Spectral fitting package (part of XANADU)

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