| proportional counter array | PCA | 480 | 62 | 1.565866 | 0001158,0001110,etc |
| low surface brightness | LSB | 973 | 61 | 1.47979 | 0001071,0001249,etc |
| high resolution imager | HRI | 675 | 54 | 1.446278 | 0001412,0001437,etc |
| signal to noise | S/N | 287 | 53 | 1.321543 | 0002062,0002195,etc |
| inverse compton | IC | 786 | 52 | 1.790984 | 0001127,0001128,etc |
| kolmogorov smirnov | KS | 210 | 51 | 1.098559 | 0001390,0001159,etc |
| all sky monitor | ASM | 315 | 47 | 1.320955 | 0001437,0001530,etc |
| space telescope imaging spectrograph | STIS | 452 | 47 | 1.895237 | 0002438,0002108,etc |
| wolf rayet | WR | 1416 | 45 | 1.848355 | 0001228,0001170,etc |
| sunyaev zel'dovich | SZ | 925 | 33 | 1.913369 | 0001393,0001106,etc |
| burst and transient source experiment | BATSE | 275 | 31 | 1.58289 | 0001480,0001122,etc |
| tully fisher | TF | 496 | 28 | 1.681488 | 0001219,0001147,etc |
| rosat all sky survey | RASS | 481 | 27 | 1.261341 | 0001319,0001505,etc |
| colour magnitude diagram | CMD | 399 | 25 | 1.92136 | 0001229,0001434,etc |
| full width half maximum | FWHM | 77 | 25 | 1.000302 | 0001407,0001449,etc |
| synchrotron self compton | SSC | 231 | 25 | 1.601582 | 0002134,0002215,etc |
| black hole candidate | BHC | 223 | 24 | 1.626315 | 0001502,0001167,etc |
| particle mesh | PM | 116 | 23 | 1.17458 | 0001099,0001347,etc |
| proportional counter unit | PCU | 110 | 22 | 1.09124 | 0002084,0002265,etc |
| greisen zatsepin kuzmin | GZK | 167 | 22 | 1.45519 | 0002155,0002006,etc |
| photodissociation region | PDR | 414 | 20 | 1.753019 | 0001336,0001035,etc |
| faint object spectrograph | FOS | 295 | 20 | 1.201339 | 0002108,0002374,etc |
| wide field planetary camera 2 | WFPC-2 | 210 | 20 | 1.300916 | 0002262,0002191,etc |
| wide field camera | WFC | 162 | 20 | 1.401144 | 0002256,0002168,etc |
| power density spectrum | PDS | 185 | 19 | 1.528542 | 0001078,0001095,etc |
| near infrared camera and multi object spectrometer | NICMOS | 257 | 19 | 1.84351 | 0002445,0002078,etc |
| narrow line seyfert 1 galaxy | NLS1 | 427 | 19 | 1.899138 | 0003023,0003055,etc |
| short wavelength spectrometer | SWS | 227 | 18 | 1.445599 | 0001228,0001155,etc |
| ministry for university and research | MURST | 18 | 17 | 1.000438 | 0001030,0001449,etc |
| wide field and planetary camera 2 | WFPC2 | 135 | 17 | 1.412469 | 0002018,0002066,etc |
| narrow field instruments | NFI | 77 | 16 | 1.250756 | 0001107,0001158,etc |
| goddard high resolution spectrograph | GHRS | 127 | 16 | 1.438692 | 0001512,0001172,etc |
| narrow line seyfert 1 | NLS1 | 271 | 16 | 2.004024 | 0005166,0005605,etc |
| compact steep spectrum | CSS | 238 | 16 | 1.501437 | 0005240,0005035,etc |
| planetary camera | PC | 265 | 15 | 1.668698 | 0005184,0005204,etc |
| intra cluster medium | ICM | 238 | 14 | 1.644883 | 0001143,0001429,etc |
| large velocity gradient | LVG | 118 | 14 | 1.143629 | 0002478,0002484,etc |
| the red giant branch | TRGB | 221 | 14 | 1.502359 | 0005305,0005015,etc |
| very high energy | VHE | 51 | 13 | 1.154168 | 0001541,0001186,etc |
| lyon meudon extragalactic database | LEDA | 38 | 12 | 1.00018 | 0001016,0001140,etc |
| friedmann robertson walker | FRW | 39 | 12 | 1.000571 | 0002281,0002156,etc |
| gigahertz peaked spectrum | GPS | 197 | 12 | 1.584416 | 0002129,0002130,etc |
| unidentified infrared band | UIB | 104 | 12 | 1.834249 | 0002195,0002209,etc |
| maximum likelihood | ML | 92 | 12 | 1.667743 | 0003204,0003091,etc |
| press schechter | P-S | 76 | 12 | 1.41756 | 0005260,0005397,etc |
| dwarf spheroidal | dSph | 243 | 12 | 1.419568 | 0005296,0005079,etc |
| x ray luminosity function | XLF | 91 | 11 | 1.728513 | 0001376,0001076,etc |
| faint object camera | FOC | 79 | 11 | 1.182606 | 0002438,0002222,etc |
| one dimensional | 1-D | 80 | 11 | 1.819013 | 0002202,0002523,etc |
| advanced ccd imaging spectrometer | ACIS | 122 | 11 | 2.001543 | 0004177,0004309,etc |
| power law | PL | 113 | 11 | 1.182851 | 0005497,0005169,etc |
| three dimensional | 3-D | 183 | 11 | 1.729043 | 0006240,0006118,etc |
| star formation history | SFH | 186 | 10 | 1.702039 | 0001468,0001055,etc |
| rayleigh taylor | RT | 47 | 10 | 1.600494 | 0001448,0001395,etc |
| nasa extragalactic database | NED | 18 | 10 | 1.000113 | 0001140,0001473,etc |
| standard cold dark matter | SCDM | 60 | 10 | 1.000591 | 0002437,0002449,etc |
| long wavelength spectrometer | LWS | 121 | 10 | 1.801459 | 0002040,0002024,etc |
| ultra luminous infrared galaxy | ULIRG | 139 | 10 | 1.602755 | 0004293,0004391,etc |
| narrow field instrument | NFI | 28 | 9 | 1.000257 | 0001355,0001530,etc |
| michelson doppler imager | MDI | 65 | 9 | 1.667792 | 0001293,0001294,etc |
| space interferometry mission | SIM | 64 | 9 | 1.556653 | 0001421,0001193,etc |
| cosmic infrared background | CIB | 287 | 9 | 1.668388 | 0002436,0002283,etc |
| position velocity | P-V | 69 | 9 | 1.222895 | 0002186,0002469,etc |
| hubble deep field north | HDF-N | 114 | 9 | 1.7808 | 0004260,0004027,etc |
| low luminosity agn | LLAGN | 81 | 9 | 1.668297 | 0006004,0006055,etc |
| monte carlo | MC | 47 | 9 | 1.667156 | 0008330,0008111,etc |
| reflection grating spectrometer | RGS | 83 | 9 | 1.556907 | 0010608,0010423,etc |
| photon dominated region | PDR | 90 | 8 | 2.000857 | 0001173,0001214,etc |
| galactic cosmic ray | GCR | 152 | 8 | 1.252999 | 0001253,0001331,etc |
| inter galactic medium | IGM | 47 | 8 | 1.376041 | 0001429,0001433,etc |
| high surface brightness | HSB | 51 | 8 | 1.252549 | 0002191,0002226,etc |
| innermost stable circular orbit | ISCO | 90 | 8 | 1.501644 | 0002528,0002394,etc |
| globular cluster luminosity function | GCLF | 129 | 8 | 1.500936 | 0002070,0002292,etc |
| optical transient | OT | 141 | 8 | 2.00191 | 0003257,0003429,etc |
| solid state imaging spectrometers | SIS | 102 | 8 | 1.751213 | 0003251,0003413,etc |
| hertzsprung russell | HR | 45 | 8 | 1.000199 | 0004119,0004208,etc |
| phoswich detector system | PDS | 136 | 8 | 2.000793 | 0005066,0005067,etc |
| atacama large millimeter array | ALMA | 14 | 8 | 1.00027 | 0005602,0005239,etc |
| orion nebula cluster | ONC | 189 | 8 | 1.752473 | 0006087,0006219,etc |
| charge transfer efficiency | CTE | 31 | 8 | 1.000478 | 0007150,0007001,etc |
| san diego supercomputer center | SDSC | 9 | 8 | 1.000191 | 0008465,0008464,etc |
| magellanic cloud | MC | 253 | 7 | 2.004023 | 0001434,0001423,etc |
| low mass x ray binaries | LMXB | 49 | 7 | 2.000777 | 0002114,0002220,etc |
| smooth particle hydrodynamics | SPH | 57 | 7 | 1.572527 | 0002426,0002499,etc |
| blue compact dwarf | BCD | 114 | 7 | 1.716089 | 0002111,0002370,etc |
| herbig haro | HH | 753 | 7 | 1.716276 | 0003031,0003357,etc |
| deutsche forschungsgemeinschaft | DFG | 8 | 7 | 1.000267 | 0003024,0003426,etc |
| broad emission line region | BELR | 66 | 7 | 1.286961 | 0005159,0005346,etc |
| five college radio astronomy observatory | FCRAO | 22 | 7 | 1.285972 | 0005522,0005237,etc |
| low energy concentrator spectrometer | LECS | 74 | 7 | 1.714951 | 0005066,0005238,etc |
| period luminosity | PL | 181 | 7 | 1.57305 | 0005069,0005112,etc |
| two dimensional | 2-D | 77 | 7 | 1.286984 | 0006240,0006324,etc |
| palomar green | PG | 132 | 7 | 2.00057 | 0007312,0007384,etc |
| science analysis system | SAS | 19 | 7 | 1.428828 | 0010608,0010328,etc |
| european photon imaging camera | EPIC | 55 | 7 | 1.430311 | 0010386,0010328,etc |
| reflection grating spectrometers | RGS | 97 | 7 | 1.287419 | 0010362,0010658,etc |
| cerro tololo interamerican observatory | CTIO | 43 | 6 | 1.000701 | 0001141,0001157,etc |
| gas imaging spectrometer | GIS | 68 | 6 | 1.667945 | 0001412,0001407,etc |
| soft gamma ray repeater | SGR | 172 | 6 | 1.672978 | 0001026,0001397,etc |
| black hole candidates | BHC | 28 | 6 | 1.334671 | 0001458,0001242,etc |
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