| proportional counter array | PCA | 57 | 7 | 2.001414 | 0104352,0104468,etc |
| wolf rayet | WR | 80 | 6 | 2.003511 | 0104330,0104420,etc |
| signal to noise | S/N | 33 | 6 | 2.00081 | 0104129,0104095,etc |
| all sky monitor | ASM | 35 | 6 | 2.000681 | 0104299,0104395,etc |
| high resolution imager | HRI | 23 | 5 | 1.000261 | 0104203,0104212,etc |
| inverse compton | IC | 97 | 5 | 2.003385 | 0104128,0104451,etc |
| black hole candidate | BHC | 56 | 5 | 2.002387 | 0104323,0104073,etc |
| san diego supercomputer center | SDSC | 5 | 5 | 1.000088 | 0104256,0104148,etc |
| narrow line seyfert 1 | NLS1 | 68 | 4 | 1.003152 | 0104203,0104125,etc |
| space telescope imaging spectrograph | STIS | 37 | 4 | 1.001492 | 0104125,0104303,etc |
| proportional counter unit | PCU | 18 | 4 | 1.000476 | 0104468,0104323,etc |
| advanced ccd imaging spectrometer | ACIS | 20 | 4 | 1.001613 | 0104270,0104453,etc |
| wide field camera | WFC | 57 | 4 | 1.002139 | 0104299,0104362,etc |
| star formation history | SFH | 114 | 4 | 2.00396 | 0104425,0104286,etc |
| greisen zatsepin kuzmin | GZK | 12 | 4 | 1.000336 | 0104033,0104291,etc |
| innermost stable circular orbit | ISCO | 50 | 4 | 2.001494 | 0104487,0104408,etc |
| wide field planetary camera 2 | WFPC2 | 44 | 4 | 2.0009 | 0104168,0104005,etc |
| low surface brightness | LSB | 48 | 3 | 2.002596 | 0104396,0104111,etc |
| low resolution imaging spectrograph | LRIS | 6 | 3 | 1.000277 | 0104129,0104108,etc |
| supernova/acceleration probe | SNAP | 62 | 3 | 2.00398 | 0104009,0104455,etc |
| high energy transmission grating spectrometer | HETGS | 21 | 3 | 1.00018 | 0104125,0104252,etc |
| high energy grating | HEG | 10 | 3 | 1.00021 | 0104125,0104035,etc |
| medium energy grating | MEG | 20 | 3 | 1.000637 | 0104125,0104035,etc |
| burst and transient source experiment | BATSE | 16 | 3 | 1.001834 | 0104468,0104208,etc |
| planetary camera | PC | 24 | 3 | 2.00062 | 0104316,0104168,etc |
| near infrared camera and multi object spectrometer | NICMOS | 41 | 3 | 2.001463 | 0104316,0104399,etc |
| phoswich detector system | PDS | 15 | 3 | 2.001422 | 0104451,0104362,etc |
| optical transient | OT | 41 | 3 | 2.001467 | 0104249,0104363,etc |
| kolmogorov smirnov | K-S | 12 | 3 | 1.000187 | 0104453,0104433,etc |
| rosat all sky survey | RASS | 7 | 3 | 1.000364 | 0104369,0104387,etc |
| monte carlo | MC | 19 | 3 | 1.000879 | 0104248,0104406,etc |
| colour magnitude diagram | CMD | 23 | 3 | 1.001215 | 0104016,0104178,etc |
| main sequence turn off | MSTO | 16 | 3 | 1.000497 | 0104292,0104202,etc |
| soft gamma ray repeater | SGR | 122 | 3 | 2.006007 | 0104287,0104199,etc |