| 1 | signal to noise | S/N | 63 | 7 | 1.003293 | 0004373,0004146,etc |
| 2 | proportional counter array | PCA | 45 | 7 | 2.001529 | 0004232,0004297,etc |
| 3 | advanced ccd imaging spectrometer | ACIS | 107 | 7 | 2.002222 | 0004177,0004309,etc |
| 4 | burst and transient source experiment | BATSE | 38 | 6 | 2.002633 | 0004232,0004020,etc |
| 5 | space telescope imaging spectrograph | STIS | 103 | 6 | 2.002904 | 0004047,0004319,etc |
| 6 | low surface brightness | LSB | 9 | 5 | 1.000466 | 0004319,0004150,etc |
| 7 | full width half maximum | FWHM | 4 | 4 | 1.000246 | 0004232,0004297,etc |
| 8 | high resolution imager | HRI | 37 | 4 | 1.001186 | 0004339,0004263,etc |
| 9 | wolf rayet | WR | 51 | 4 | 1.000915 | 0004020,0004383,etc |
| 10 | wide field planetary camera 2 | WFPC2 | 12 | 4 | 1.000173 | 0004259,0004147,etc |
| 11 | michelson doppler imager | MDI | 26 | 3 | 2.001464 | 0004335,0004082,etc |
| 12 | ministry for university and research | MURST | 4 | 3 | 1.000032 | 0004040,0004118,etc |
| 13 | standard cold dark matter | SCDM | 9 | 3 | 1.000481 | 0004349,0004319,etc |
| 14 | high resolution camera | HRC | 43 | 3 | 2.000887 | 0004177,0004127,etc |
| 15 | high resolution mirror assembly | HRMA | 39 | 3 | 2.002242 | 0004177,0004127,etc |
| 16 | all sky monitor | ASM | 16 | 3 | 2.000775 | 0004020,0004223,etc |
| 17 | seyfert | Sy | 52 | 3 | 2.004442 | 0004108,0004301,etc |
| 18 | inverse compton | IC | 37 | 3 | 2.000982 | 0004280,0004355,etc |
| 19 | two degree field | 2DF | 8 | 3 | 1.000344 | 0004271,0004341,etc |
| 20 | friedmann robertson walker | FRW | 3 | 3 | 1.000165 | 0004196,0004138,etc |
| 21 | black hole candidate | BHC | 17 | 3 | 1.001772 | 0004211,0004236,etc |