| PaAlgo | Miscellaneous functions |
| PaCaloCellType | Calorimeter cell properties |
| PaCaloClus | Calorimeter cluster |
| PaCalorimCell | Calorimeter cell type, position, calibrations |
| PaCalorimeter | Calorimeter Detector geometry |
| PaDetect | Tracking detector |
| PaDigit | Raw information |
| PaEvent | COMPASS event |
| PaField | Magnetic fields |
| PaHit | Detector's measurement |
| PaMaterialMaps | Material Maps |
| PaMCgen | MC generator information |
| PaMChit | MonteCarlo hit |
| PaMCtrack | MonteCarlo track |
| PaMCvertex | MonteCarlo vertex |
| PaMetaDB | Calibrations, coefficients etc |
| PaMtx | Scalar / Vector / Matrix |
| PaParticle | Reconstructed particle |
| PaPid | Functions for RICH particle identification |
| PaRich | Rich Detector geometry |
| PaRichDet | Rich photon detector element (photocathode) |
| PaRichMirr | Rich mirror element |
| PaSetup | COMPASS setup (geometry, magnetic fields etc.) |
| PaTPar | Trajectory parameters |
| PaTrack | Track |
| PaTrigger | Trigger and Online filter related algorithms and methods |
| PaVertex | Vertex |
| Phast | General purpose interface |
1.6.2