| ALIAS | adverb to alias antenna numbers to one another |
| ALLOKAY | specifies that initial conditions have been met. |
| ANTENNAS | Antennas to include/exclude from the task or verb |
| ANTNAME | A list of antenna (station) names |
| ANTUSE | Antennas to include/exclude from the task or verb |
| ANTWT | Antenna Weights for UV data correction in Calibration |
| APARM | General numeric array adverb used many places |
| ARRAY1 | General scratch array adverb |
| ARRAY2 | General scratch array adverb |
| ARRAY3 | General scratch array adverb |
| ASDMFILE | Full path to EVLA ASDM/BDF directory |
| ASPMM | Plot scaling parameter - arc seconds per millimeter on plot |
| AVERSION | Specify a version of the ALBUS container |
| AVGCHAN | Controls averaging of spectral channels |
| AVGIF | Controls averaging of IF channels |
| AVOPTION | Controls type or range of averaging done by a task |
| AX2REF | Second reference pixel number |
| AXINC | Axis increment - change in coordinate between pixels |
| AXREF | Reference pixel number |
| AXTYPE | Type of coordinate axis |
| AXVAL | Value of axis coordinate at reference pixel |
| BADDISK | specifies which disks are to be avoided for scratch files |
| BAND | specifies the approximate frequency of UV data to be selected |
| BANDPOL | specifies polarizations of individual IFs |
| BASELINE | specifies which antenna pairs are to be selected/deselected |
| BATFLINE | specifies starting line in a batch work file |
| BATNLINE | specifies the number of lines to process in a batch work file |
| BATQUE | specifies the desired batch queue |
| BB | spare adverb for use in procedures |
| BCHAN | sets the beginning channel number |
| BCOMP | gives beginning component number for multiple fields |
| BCOUNT | gives beginning location for start of a process |
| BDROP | gives number of pooints dropped at the beginning |
| BIF | gives first IF (spectral window) to be included |
| BITER | gives beginning point for some iterative process |
| BLC | gives lower-left-corner of selected subimage |
| BLOCKING | specifies blocking factor to use on e.g. tape records |
| BLVER | specifies the version of the baseline-calibration table used |
| BMAJ | gives major axis size of beam or component |
| BMIN | gives minor axis size of beam or component |
| BOX | specifies pixel coordinates of subarrays of an image |
| BOXFILE | specifies name of Clean box text file |
| BPA | gives position angle of major axis of beam or component |
| BPARM | general numeric array adverb used too many places |
| BPASS5 | Normalization control in BPASS for VLBARUN |
| BPASSPRM | Control adverb array for bandpass calibration |
| BPRINT | gives beginning location for start of a printing process |
| BPSOLINT | Sets SOLINT in BPASS for VLBARUN |
| BPVER | specifies the version of the bandpass table to be applied |
| BWSMEAR | amount of bandwidth smearing correction to use |
| CALCODE | specifies the type of calibrator to be selected |
| CALIN | specifies name of input disk file usually with calibration data |
| CALSOUR | specifies source names to be included in calibration |
| CALTASK | Controls which calibration task is used when by VLBARUN |
| CATNO | Specifies AIPS catalog slot number range |
| CBPLOT | selects a display of a Clean beam full width at half maximum |
| CCBOX | specifies pixel coordinates of subarrays of an image |
| CELLSIZE | gives the pixel size in physical coordinates |
| CHANNEL | sets the spectral channel number |
| CHANSEL | Array of start, stop, increment channel numbers to average |
| CHINC | the increment between selected channels |
| CLBOX | specifies subarrays of an image for Clean to search |
| CLCORPRM | Parameter adverb array for task CLCOR |
| CLEV | Contour level multiplier in physical units |
| CLINT | CL table entry interval |
| CMETHOD | specifies the method by which the uv model is computed |
| CMODEL | specifies the method by which the uv model is computed |
| CODETYPE | specifies the desired operation or data type |
| COLORS | specifies the desired TV colors |
| COMMENT | 64-character comment string |
| CON3COL | Controls use of full 3-color graphics for contouring |
| CONFIG | Configuration ID number within an EVLA ASDM/BDF data set |
| COOINC | Celestial axes increment: change in coordinate between pixels |
| COORDINA | Array to hold coordinate values |
| COOREF | Reference pixel number for two coordinate axes |
| COOTYPE | Celestial axes projection type |
| COPIES | sets the number of copies to be made |
| CPARM | general numeric array adverb used many places |
| CROWDED | allows a task to perform its function in a crowded fashion |
| CTYPE | specifies type of component |
| CUTOFF | specifies a limit below or above which the operation ends |
| DARKLINE | The level at which vectors are switched from light to dark |
| DATA2IN | specifies name of input FITS disk file |
| DATAIN | specifies name of input FITS disk file |
| DATAOUT | specifies name of output FITS disk file |
| DCHANSEL | Array of start, stop, increment channel #S + IF to avoid |
| DCODE | General string adverb |
| DDISK | Deterimins where input Y2K data are found |
| DECIMAL | specifies if something is in decimal format |
| DECSHIFT | gives Y-coordinate shift of an image center from reference |
| DEFER | Controls when file creation takes place |
| DELCORR | Controls task actions on calibration tables. |
| DELTAX | Increment or size in X direction |
| DELTAY | Increment or size in Y direction |
| DENSITY | gives the desired tape density |
| DENUMB | a scalar decimal number |
| DETIME | specifies a time interval for an operation (destroy, batch) |
| DIGICOR | specifies whether VLBA digital corrections are to be applied |
| DIST | gives a distance |
| DO3COLOR | Controls whether full 3-color graphics are used in a plot |
| DO3DIMAG | specifies whether uvw’s are reprojected to each field center |
| DOACOR | specifies whether autocorrelation data are included |
| DOALIGN | specifies how two or more images are aligned in computations |
| DOALL | specifies if an operation is done once or for all matching |
| DOALPHA | specifies whether some list is alphabetized |
| DOAPPLY | Flag to indicate whether an operation is applied to the data |
| DOARRAY | spcifies if subarrays are ignored or the information used |
| DOBAND | specifies if/how bandpass calibration is applied |
| DOBLANK | controls handling of blanking |
| DOBTWEEN | Controls smoothing between sources in calibration tables |
| DOCALIB | specifies whether a gain table is to be applied or not |
| DOCAT | specifies whether the output is saved (cataloged) or not |
| DOCELL | selects units of cells over angular unit |
| DOCENTER | selects something related to centering |
| DOCIRCLE | select a ”circular” display (i.e. trace coordinates, ...) |
| DOCLIP | Controls whether and how a CLIP operation is performed |
| DOCOLOR | specifies whether coloring is done |
| DOCONCAT | selects concatenated or indivudual output files |
| DOCONFRM | selects user confirmation modes of repetitive operation |
| DOCONT | selects a display of contour lines |
| DOCRT | selects printer display or CRT display (giving width) |
| DODARK | specifies whether ”dark” vectors are plotted dark or light |
| DODATE | specifies if the dat and time are to be used in some way |
| DODELAY | selects solution for phase/amplitude or delay rate/phase |
| DOEBAR | Controls display of estimates of the uncertainty in the data |
| DOEOF | selects end-of-file writing or reading until |
| DOEOT | selects tape positioning before operation: present or EOI |
| DOFIT | Controls which antennas are fit by what methods |
| DOFLAG | Controls closure cutoff in gain solutions and flagging |
| DOFRACT | Tells whether to compute a fraction or ratio |
| DOGREY | selects a display of a grey-scale image |
| DOGRIDCR | selects correction for gridding convolution function |
| DOHIST | selects a histogram display or controls writing of history file |
| DOHMS | selects sexagesimal (hours-mins-secs) display format |
| DOIFS | controls functions done across IFs |
| DOINVERS | selects opposite of normal function |
| DOKEEP | specifies if something is kept or deleted |
| DOMAX | selects solutions for maxima of models |
| DOMODEL | selects display of model function |
| DONEWTAB | do we make new tables, use a new table format, etc. |
| DOOUTPUT | selects whether output image or whatever is saved / discarded |
| DOPLOT | Controls plotting of something |
| DOPOL | selects application of any polarization calibration |
| DOPOS | selects solutions for positions of model components |
| DOPRINT | selects printer display or CRT display (giving width) |
| DOREAL | Say to do operation with real/imaginary rather than amplitude/phase |
| DORESID | selects display of differences between model and data |
| DOROBUST | Controls method of averaging - simple mean/rms or robust |
| DOSCALE | specifies if a scaling operation of some sort is to be performed |
| DOSCAN | specifies if a scan-related operation is to be done |
| DOSLICE | selects display of slice data |
| DOSPIX | selects solutions for spectral index of model components |
| DOSTOKES | selects options related to polarizations |
| DOTABLE | selects use of table-format for data |
| DOTV | selects use of TV display option in operation |
| DOTWO | do we make two of something |
| DOUVCOMP | selects use of compression in writing UV data to disk |
| DOVECT | selects display of polarization vectors |
| DOWAIT | selects wait-for-completion mode for running tasks |
| DOWEDGE | selects display of intensity step wedge |
| DOWEIGHT | selects operations with data weights |
| DOWIDTH | selects solution for widths of model components |
| DPARM | General numeric array adverb used many places |
| ECHAN | define an end for a range of channel numbers |
| ECOUNT | give the highest count or iteration for some process |
| EDGSKP | Deterimins border excluded from comparision or use |
| EDROP | number of points/iterations to be omitted from end of process |
| EFACTOR | scales some error analysis process |
| EHNUMB | an extended hexadecimal ”number” |
| EIF | last IF (spectral window) number to be included in operation |
| EPRINT | gives location for end of a printing process |
| ERROR | was there an error |
| EXPERT | specifies an user experience level or mode |
| FACTOR | scales some display or CLEANing process |
| FGAUSS | Minimum flux to Clean to by widths of Gaussian models |
| FITOUT | specifies name of output text file for results of fitting |
| FLAGVER | selects version of the flagging table to be applied |
| FLDSIZE | specifies size(s) of images to be processed |
| FLMCOMM | Comment for film recorder image. |
| FLUX | gives a total intensity value for image/component or to limit |
| FMAX | specifies peak values of model components - results of fits |
| FORMAT | gives a format code number: e.g. FITS accuracy required |
| FOV | Specifies the field of view |
| FPARM | General numeric array adverb used in modeling |
| FPOS | specifies pixel positions of fit model components |
| FQCENTER | specifies that the frequency axis should be centered |
| FQTOL | Frequency tolerance with which FQ or frequency entries are accepted. |
| FREQID | Frequency Identifier for frequency, bandwidth combination |
| FREQSEL | List of frequencies desired |
| FSHIFT | specifies a position shift - output from fitting routines |
| FSIZE | file size in Megabytes |
| FUNCTYPE | specifies type of intensity transfer function |
| FWIDTH | gives widths of model components - results of fitting |
| GAIN | specifies loop gain for deconvolutions |
| GAINERR | gives estimate of gain uncertainty for each antenna |
| GAINUSE | specifies output gain table or gain table applied to data |
| GAINVER | specifies the input gain table |
| GCVER | specifies the version of the gain curve table used |
| GG | spare scalar adverb for use in procedures |
| GMAX | specifies peak values of model components |
| GPOS | specifies pixel positions of model components |
| GR2CHAN | specifies a second TV graphics channel to be used |
| GRADDRES | specifies user’s home address for replies to gripes |
| GRCHAN | specifies the TV graphics channel to be used |
| GREMAIL | gives user’s e-mail address name for reply to gripe entry |
| GRNAME | gives user’s name for reply to gripe entry |
| GRPHONE | specifies phone number to call for questions about a gripe |
| GUARD | portion of UV plane to receive no data in gridding |
| GWIDTH | gives widths of model components |
| HIEND | End record number in a history-file operation |
| HISTART | Start record number in a history-file operation |
| I | spare scalar adverb for use in procedures |
| ICHANSEL | Array of start, stop, increment channel #S + IF to average |
| ICUT | specifies a cutoff level in units of the image |
| IM2PARM | Specifes enhancement parameters for OOP-based imaging: 2nd set |
| IMAGRPRM | Specifes enhancement parameters for OOP-based imaging |
| IMSIZE | specifies number of pixels on X and Y axis of an image |
| IN2CLASS | specifies the ”class” of the 2nd input image or data base |
| IN2DISK | specifies the disk drive of the 2nd input image or data base |
| IN2EXT | specifies the type of the 2nd input extension file |
| IN2FILE | specifies name of a disk file, outside the regular catalog |
| IN2NAME | specifies the ”name” of the 2nd input image or data base |
| IN2SEQ | specifies the sequence # of the 2nd input image or data base |
| IN2TYPE | specifies the type of the 2nd input image or data base |
| IN2VERS | specifies the version number of the 2nd input extension file |
| IN3CLASS | specifies the ”class” of the 3rd input image or data base |
| IN3DISK | specifies the disk drive of the 3rd input image or data base |
| IN3EXT | specifies the type of the 3rd input extension file |
| IN3NAME | specifies the ”name” of the 3rd input image or data base |
| IN3SEQ | specifies the sequence # of the 3rd input image or data base |
| IN3TYPE | specifies the type of the 3rd input image or data base |
| IN3VERS | specifies the version number of the 3rd input extension file |
| IN4CLASS | specifies the ”class” of the 4th input image or data base |
| IN4DISK | specifies the disk drive of the 4th input image or data base |
| IN4NAME | specifies the ”name” of the 4th input image or data base |
| IN4SEQ | specifies the sequence # of the 4th input image or data base |
| IN4TYPE | specifies the type of the 4th input image or data base |
| IN4VERS | specifies the version number of the 4th input extension file |
| IN5CLASS | specifies the ”class” of the 5th input image or data base |
| IN5DISK | specifies the disk drive of the 5th input image or data base |
| IN5NAME | specifies the ”name” of the 5th input image or data base |
| IN5SEQ | specifies the sequence # of the 5th input image or data base |
| IN5TYPE | specifies the type of the 5th input image or data base |
| IN5VERS | specifies the version number of the 5th input extension file |
| INCLASS | specifies the ”class” of the 1st input image or data base |
| INDISK | specifies the disk drive of the 1st input image or data base |
| INEXT | specifies the type of the 1st input extension file |
| INFILE | specifies name of a disk file, outside the regular catalog |
| INLIST | specifies name of input disk file, usually a source list |
| INNAME | specifies the ”name” of the 1st input image or data base |
| INSEQ | specifies the sequence # of the 1st input image or data base |
| INTAPE | specifies the input tape drive number |
| INTERPOL | specifies the type of averaging done on the complex gains |
| INTEXT | specifies name of input text file, not in regular catalog |
| INTPARM | specifies the parameters of the frequency interpolation function |
| INTTIME | adds user-generated lines to the history extension file |
| INTYPE | specifies the type of the 1st input image or data base |
| INVERS | specifies the version number of the 1st input extension file |
| IOTAPE | Deterimins which tape drive is used during a Y2K RUN |
| ISCALIB | states that the current source is a point-source calibrator |
| J | spare scalar adverb for use in procedures |
| JOBNUM | specifies the batch job number |
| KEYSTRNG | gives contents of character-valued keyword parameter |
| KEYTYPE | Adverb giving the keyword data type code |
| KEYVALUE | gives contents of numeric-valued keyword parameter |
| KEYWORD | gives name of keyword parameter - i.e. name of header field |
| KK | Spare adverb for use in procedures |
| LABEL | selects a type of extra labeling for a plot |
| LEVS | list of multiples of the basic level to be contoured |
| LPEN | specifies the ”pen width” code # =¿ width of plotted lines |
| LTYPE | specifies the type and degree of axis labels on plots |
| MAPSHIFT | used by MAPPR to specify the shift of the image from the phase center |
| MAXPIXEL | maximum pixels searched for components in Clark CLEAN |
| MAXVERS | The maximum version number of a specified extension file type |
| MDISK | Determins where input Y2K data are found |
| MINAMPER | specifies the minimum amplitude error prior to some action |
| MINANTEN | states minimum number of antennas for a solution |
| MINPATCH | specifies the minimum size allowed for the center of the beam |
| MINPHSER | specifies the minimum phase error prior to some action |
| MPDIFS | Retains comparison differences between current images and master ones |
| NAXIS | Axis number |
| NBOXES | Number of boxes |
| NCCBOX | Number of clean component boxes |
| NCHAN | Number of spectral channels in each spectral window |
| NCHAV | Number of channels averaged in an operation |
| NCOMP | Number of CLEAN components |
| NCOUNT | General adverb, usually a count of something |
| NDIG | Number of digits to display |
| NFIELD | The number of fields imaged |
| NFILES | The number of files to skip, usually on a tape. |
| NGAUSS | Number of Gaussians to fit |
| NIF | Number of IFs (spectral windows) in a data set |
| NITER | The number of iterations of a process. |
| NMAPS | Number of maps (images) in an operation |
| NOISE | estimates the noise in images, noise level cutoff |
| NORMALIZ | specifies the type of gain normaliztion if any |
| NPIECE | The number of pieces to make |
| NPLOTS | gives number of plots per page or per job |
| NPOINTS | General adverb giving the number of something |
| NPRINT | gives number of items to be printed |
| NSKIP | Number of objects to skip |
| NTHREAD | Controls number of threads used by multi-threaded processes in OBIT |
| NUMTELL | selects POPS number of task which is the target of a TELL or ABORT |
| NX | General adverb referring to a number of things in the X direction |
| NY | General adverb referring to a number of things in the Y direction |
| OBJECT | The name of an object |
| OBOXFILE | specifies name of output Clean box text file |
| OFFSET | General adverb, the offset of something. |
| OFMFILE | specifies the name of a text file containing OFM values |
| OLDVOL | used by READISK to specify the disk number when WRITDISK was run |
| ONEBEAM | specifies whether one beam is made for all facets or one for each |
| ONEFREQ | states that the current CC model was made with one frequency |
| OPCODE | General adverb, defines an operation |
| OPTELL | The operation to be passed to a task by TELL |
| OPTYPE | General adverb, defines a type of operation. |
| ORDER | Adverb used usually to specify the order of polynomial fit |
| OTFMODE | Specifies whether the data are in on-the-fly mode or not |
| OUT2CLAS | The class of a secondary output file |
| OUT2DISK | The disk number of a secondary output file. |
| OUT2NAME | The name of a secondary output file. |
| OUT2SEQ | The sequence of a secondary output file. |
| OUTCLASS | The class of an output file |
| OUTDISK | The disk number of an output file. |
| OUTFGVER | selects version of the flagging table to be written |
| OUTFILE | specifies name of output disk file, not in regular catalog |
| OUTNAME | The name of an output file. |
| OUTPRINT | Specifies name of disk file to keep the printer output |
| OUTSEQ | The sequence of an output file. |
| OUTTAPE | The output tape drive number. |
| OUTTEXT | specifies name of output text file, not in regular catalog |
| OUTVERS | The output version number of an extension file (table). |
| OVERLAP | specifies how overlaps are to be handled |
| OVRSWTCH | specifies when IMAGR switches from OVERLAP ¿= 2 to OVERLAP = 1 mode |
| PBPARM | Primary beam parameters |
| PBSIZE | estimates the primary beam size in interferometer images |
| PCUT | Cutoff in polarized intensity |
| PDVER | specifies the version of the spetral polarization table to use |
| PHASPRM | Phase data array, by antenna number. |
| PHAT | Prussian hat size |
| PHSLIMIT | gives a phase value in degrees |
| PIX2VAL | An image value in the units specified in the header. |
| PIX2XY | Specifies a pixel in an image |
| PIXAVG | Average image value |
| PIXRANGE | Range of pixel values to display |
| PIXSTD | RMS pixel deviation |
| PIXVAL | Value of a pixel |
| PIXXY | Specifies a pixel location. |
| PLCOLORS | specifies the colors to be used |
| PLEV | Percentage of peak to use for contour levels |
| PLVER | specifies the version number of a PL extension file |
| PMODEL | Polarization model parameters |
| POL3COL | Controls use of full 3-color graphics for polarization lines |
| POLANGLE | Intrinsic polarization angles for up to 30 sources |
| POLPLOT | specifies the desired polarization ratio before plotting. |
| PPARM | used by PEELR to list the facets to be ”peeled” |
| PRIORITY | Limits prioroty of messages printed |
| PRNUMBER | POPS number of messages |
| PROGRAM | Specify a program to be used |
| PRSTART | First record number in a print operation |
| PRTASK | Task name selected for printed information |
| PRTIME | Time limit |
| PRTLEV | Specifies a code for the amount of information requested. |
| PRTLIMIT | specifies limits to printing functions |
| PVPLOT | selects a display of a polarization vector in a box in a corner |
| QCREATE | adverb controlling the way large files are created |
| QUAL | Source qualifier |
| QUANTIZE | Quantization level to use |
| RADIUS | Specify a radius in an image |
| RASHIFT | Shift in RA |
| REASON | The reason for an operation |
| REFANT | Reference antenna number |
| REFDATE | To specify the initial or reference date of a data set |
| REFREQ | Specifies the frequency to be uased as the reference |
| REMHOST | gives the name of another computer which will provide service |
| REMQUE | specifies the desired batch queue on a remote computer |
| REMTAPE | gives the number of another computer’s tape device |
| RESTFREQ | Rest frequency of a transition |
| REWEIGHT | Reweighting factors for UV data weights. |
| RGBCOLOR | specifies the desired TV graphics color |
| RGBGAMMA | specifies the desired color gamma corrections |
| RGBLEVS | colors to be applied to the contour levels |
| RMSLIMIT | selects things with RMS above this limit |
| ROBUST | Uniform weighting ”robustness” parameter |
| ROMODE | Specified roam mode |
| ROTATE | Specifies a rotation |
| ROTMEAS | Tells the rotation measure of a source |
| RPARM | General numeric array adverb used in modeling |
| SAMPTYPE | Specifies sampling type |
| SCALR1 | General adverb |
| SCALR2 | General adverb |
| SCALR3 | General adverb |
| SCANLENG | specify length of ”scan” |
| SCUTOFF | noise level cutoff |
| SEARCH | Ordered list of antennas for fring searches |
| SELBAND | SpecifieS bandwidth of the desired frequency ID |
| SELFREQ | Specifies frequency of desired frequency ID |
| SHIFT | specifies a position shift |
| SKEW | Specifies a skew angle |
| SLOT | Specifies AIPS catalog slot number |
| SMODEL | Source model |
| SMOOTH | Specifies spectral smoothing |
| SMOTYPE | Specifies smoothing |
| SNCORPRM | Task-specific parameters for SNCOR. |
| SNVER | specifies the output solution table |
| SOLCON | Gain solution constraint factor |
| SOLINT | Solution interval |
| SOLMIN | Minimum number of solution sub-intervals in a solution |
| SOLMODE | Solution mode |
| SOLSUB | Solution sub-interval |
| SOLTYPE | Solution type |
| SORT | Specified desired sort order |
| SOUCODE | Calibrator code for source, not calibrator, selection |
| SOURCES | A list of source names |
| SPARM | General string array adverb |
| SPECFLUX | Specifies the flux at the reference frequency |
| SPECINDX | Spectral index used to correct calibrations |
| SPECPARM | Spectral index per polarization per source |
| SPECTRAL | Flag to indicate whether an operation is spectral or continuum |
| SPECURVE | Spectral index survature used to correct calibrations |
| SRCALIAS | A list of source names, used as an alias |
| SRCNAME | A single source name |
| STFACTOR | scales star display or SDI CLEANing process |
| STOKES | Stokes parameter |
| STORE | Store current POPS environment |
| STRA1 | General string adverb |
| STRA2 | General string adverb |
| STRA3 | General string adverb |
| STRB1 | General string adverb |
| STRB2 | General string adverb |
| STRB3 | General string adverb |
| STRC1 | General string adverb |
| STRC2 | General string adverb |
| STRC3 | General string adverb |
| STVERS | star display table version number |
| SUBARRAY | Subarray number |
| SYMBOL | General adverb, probably defines a plotting symbol type |
| SYS2COM | specifies a command to be sent to the operating system |
| SYSCOM | specifies a command to be sent to the operating system |
| SYSOUT | specifies the output device or file used by the system |
| SYSVEL | Systemic velocity |
| TASK | Name of a task |
| TAU0 | Opacities by antenna number |
| TBLC | Gives the bottom left corner of an image to be displayed |
| TCODE | Deterimins which type of Y2K is RUN. |
| TDISK | Deterimins where output Y2K data is placed |
| TERSE | Controls the amount of information printed by the Y2K tests |
| THEDATE | contains the date and time in a string form |
| TIME2 | used by VLBAMPCL as the time range for a second calibrator scan |
| TIMERANG | Specifies a time range |
| TIMETOL | used by MERGECAL to control accuracy when comparing times |
| TIMSMO | Specifiessmoothing times |
| TMASK | Deterimins which tasks are executed when a Y2K is RUN. |
| TMODE | Deterimins which input is used when a Y2K is RUN. |
| TNAMF | Internal variable for Y2K test suite |
| TRANSCOD | Specified desired transposition of an image |
| TRC | Specified the top right corner of a subimage |
| TRECVR | Receiver temperatures by polarization and antenna |
| TRIANGLE | specifies closure triangles to be selected/deselected |
| TT | spare scalar adverb for use in procedures |
| TTRC | Specifies the top right corner of a subimage to be displayed |
| TV2CHAN | Specified a second TV channel (plane) used in some operations |
| TVBUT | Tells which AIPS TV button was pushed |
| TVCHAN | Specified a TV channel (plane) |
| TVCORN | Specified the TV pixel for the bottom left corner of an image |
| TVLEVS | Gives the peak intensity to be displayed in levels |
| TVXY | Pixel position on the TV screen |
| TXINC | TV X coordinate increment |
| TYINC | TV Y coordinate increment |
| TYVER | specifies the version of the system temperature table used |
| TZINC | TV Z coordinate increment |
| USERID | User number |
| UVBOX | radius of the smoothing box used for uniform weighting |
| UVBXFN | type of function used when counting for uniform weighting |
| UVCOPPRM | Parameter adverb array for task UVCOP |
| UVFIXPRM | Parameter adverb array for task UVFIX |
| UVRANGE | Specify range of projected baselines |
| UVSIZE | specifies number of pixels on X and Y axes of a UV image |
| UVTAPER | Widths in U and V of gaussian weighting taper function |
| UVWTFN | Specify weighting function, Uniform or Natural |
| VCODE | General string adverb |
| VECTOR | selects method of averaging UV data |
| VELDEF | Specifies velocity definition |
| VELTYP | Velocity frame of reference |
| VERSION | Specify AIPS version or local task area |
| VLAMODE | VLA observing mode |
| VLAOBS | Observing program or part of observer’s name |
| VLBINPRM | Control parameters to read data from NRAO/MPI MkII correlators |
| VNUMBER | Specifies the task parameter (VGET/VPUT) save area |
| VPARM | General numeric array adverb used in modeling |
| WEIGHTIT | Controls modification of weights before gain/fringe solutions |
| WGAUSS | Widths of Gaussian models (FWHM) |
| WTTHRESH | defines the weight threshold for data acceptance |
| WTUV | Specifies the weight to use for UV data outside UVRANGE |
| X | spare scalar adverb for use in procedures |
| XAXIS | Which parameter is plotted on the horizontal axis. |
| XINC | increment associated with an array of numbers |
| XPARM | General adverb for up to 10 parameters, may refer to X coord |
| XTYPE | X axis (U) convolving function type |
| XYPHASE | X-Y phase differences |
| XYRATIO | Ratio of X to Y units per pixel |
| Y | spare scalar adverb for use in procedures |
| Y2KDISK | Specifies logical name of disk area for Y2K to read or write |
| Y2KFILE | File name of the current Y2K disk file |
| Y2KSIZE | Specifies the size of the Y2K test to be run |
| YINC | Y axis increment |
| YPARM | Specifies Y axis convolving function |
| YTYPE | Y axis (V) convolving function type |
| ZEROSP | Specify how to include zero spacing fluxes in FT of UV data |
| ZINC | Set the increment of the third axis |
| ZXRATIO | Ratio between Z axis (pixel value) and X axis |