| AHF | Attitude History File |
| APD | Absolute Pointing Drift |
| BSM | Basic Spectroscopy Mode |
| CAL | Calibration Access Layer |
| CC | Cross-Correlation |
| CCD | Charged Couple Device |
| CCF | Current Calibration File |
| CDS | Centre de Données astronomiques de Strasbourg |
| CSG | Clock Sequence Generator (how a CCD is read out) |
| COBT | Computed On Board Time |
| DPP | Data Pre Processor |
| DPU | Data Processing Unit |
| DPU | Digital Processing Unit (OM: 1024sec) |
| DSP | Digital Signal Processor (OM) |
| EDU | Event Detection Unit |
| EPDH | EPIC Data Handling |
| EPEA | EPIC Event Analyser |
| EPIC | European Photon Imaging Camera |
| ERM | EPIC Radiation Monitor |
| ERT | Earth Reception Time |
| ESA | European Space Agency |
| ESOC | European Space Operation Centre |
| EXAFS | Extended X-Ray Absorption Fine Structure |
| FIFO | First-In, First-Out |
| FITS | Flexible Image Transport System |
| FOV | Field-of-view |
| FFT | Fast Fourier Transform |
| GO | Guest Observer |
| GS | Guide Star |
| GT/O | Guaranteed Time/Observer |
| HDU | Header Data Unit |
| HEASARC | High Energy Astrophysics Science Archive Research Centre |
| HTML | Hyper-text Mark-up Language |
| HTR | High Time Resolution |
| HTRM | High Time Resolution Mode |
| MIP | Minimum Ionizing Particle |
| MOC | Mission Operation Centre |
| No. | Number |
| OBDH | On-Board Data Handler |
| OBT | On Board Time |
| OCB | On Chip Binning |
| ODF | Observation Data Files |
| ODS | Observation Data Subsystem |
| OGIP | Office of Guest Investigator Programs |
| OM | Optical Monitor |
| OSW | Observation Science Window |
| Portable Data Format | |
| PSF | Point Spread Function |
| PI | Principal Investigator |
| PNG | Portable Network Graphics |
| PPS | Processing Pipeline Subsystem |
| RGS | Reflection Grating Spectrometer |
| ROSAT | RÖntgenSATellit |
| SAS | Science Analysis Subsystem |
| SCS | Science Control System |
| SDF | Slew Data Files |
| SIMBAD | Set of Identifications, Measurements, and Bibliography for Astronomical Data |
| SL | Source list |
| SOC | Science Operation Centre |
| SSC | Survey Science Centre |
| SWP | Science Window Parameter |
| TS | Time Series |
| URL | Uniform Resource Locators |
| UTC | Coordinated Universal Time |
| XID | X-ray IDentifier |
| XMM-Newton | X-ray Multi-Mirror Mission |
In Tabs. 4, 5, 6, 7, 8, 9, 10, 12, 13, 14, 15, 17, 18, 19, 21, 22, 25, 26, 27, and 28, the following convention is used for the column ``Type'': 1J = INTEGER*4; 1I = INTEGER*2; 1B = BYTE, XXA = CHARACTER*XX; XX.YF = FLOAT with XX digits total, Y digits of significance