Update this file with the 'makeindex' command. Do not edit directly. General help topics: ------------------- antenna_names A description of the format of telescope specifications. editing General discussion of editing in difmap. models An overview of how models are used in difmap. multi_if An overview of multi-IF mapping. polarization Overview of Difmap polarization mapping. spectral_line An overview of the current spectral-line facilities. subarrays A discussion of sub-array handling in Difmap. whatsnew The details of recent difmap changes. Functions and commands: ---------------------- addcmp Add a model component by hand to the tentative model. addhist Append a new line to the recorded history of an observation. addwin Append a new entry to the list of clean windows. basename Returns the name of baseline 'ibase' of sub-array 'isub'. beamloc Change when and where mapplot plots the clean beam ellipse. clean Clean a residual dirty map with the dirty beam. clrhist Clear the history information recorded with the observation. clrmod Clear one or more of the established, tentative and continuum models. clroff Undo all resoff calibration-offsets applied during this difmap session. corplot Display accumulated telescope based self-cal corrections versus UT. cpplot Interactive display and editing of observed and model closure phases. delwin Delete all clean windows. edmodel Modify the established and tentative models with an external editor. get Restore UV data, models and windows from files. gscale Self calibrate to determine overall telescope amplitude corrections. header List useful parts of the observation header on one's terminal. imstat Return image plane map statistics. invert Grid selected UV data and Fourier invert it to a (residual) dirty map keep Establish the latest CLEAN model and compute its UV representation. loglevs Set logarithmic contour levels for mapplot. mapcolor Select the colormap type, brightness and contrast to use in mapplot. mapfunc Change the transfer function and data range displayed in mapplot. maplot Alternative name for the mapplot command - see help mapplot. mapplot Display the dirty beam, residual or restored map and modify CLEAN windows. mapsize Request a new map grid of given width and cell size mapunits Change the units used to specify and label map and UV plane distances. mapvalue Return the value of the map pixel nearest to a given coordinate. modelfit Fit image-plane model components to visibilities in the UV plane. nbase Return the number of baselines in a given sub-array. nchan Return the count of the number of spectral-line channels per IF. nif Return the number of IFs in the current observation. nsub Return the number of sub-arrays in the current observation. ntel Return the number of telescopes in a given sub-array. observe Read UV data from a random-groups UV FITS file. peak Return details of the min,max or absolute max flux in a map. peakwin Place a CLEAN window around the brightest pixel in the residual map. projplot Plot visibility amplitudes and/or phases versus projected UV distance. radplot Plot visibility amplitudes and/or phases versus UV radius. resoff Determine and apply a baseline based amplitude and phase correction. restore Add the CLEAN model to the residual map to form a clean map. rmodel Read a new CLEAN model from a VLBI model file. rwins Read windows previously saved CLEAN windows from a text file. save Save UV data, models, windows, the restored map and a command file. scangap Change the time gap used to delimit neighboring scans. select Select a polarization and ranges of spectral-line channels to be processed. selfant Set antenna based constraints for subsequent self-calibration. selfcal Self calibrate for telescope phase (and amplitude) corrections. selfflag Control the identification and fate of un-correctable visibilities. selflims Set limits on acceptable amplitude and phase corrections in selfcal. selftaper Sets a (1 - gaussian) taper to weight down SHORT baselines. setcont Add the current model to the continuum model. shift Shift the observation phase-center, CLEAN window and model positions. showhist Display the history that was recorded with the current observation. showpar Display a list of difmap configuration parameters. specbase Select baselines to be displayed by specplot. specopt Preset specplot display options. specorder Set the order in which specplot plots spectra. specplot Plot time-averaged visibility spectra. specpol Select the list of polarizations to be displayed by specplot. specsmooth Preset the spectral resolution displayed by specplot. spectime Select the range(s) of times to be averaged by the specplot command. specuvr Select the UV radius ranges to be displayed by specplot. startmod Read a starting model from disk and phase self-calibrate against it. telname Returns the name of telescope 'itel' of sub-array 'isub'. tplot Plot time sampling for each telescope of an observation. uncalib Undo recorded telescope calibrations (eg. self-cal corrections). unshift Undo accumulated position shifts from the data, windows and models. uvaver Time average a UV data set. uvplot Plot observed UV points on the UV plane. uvrange Set the min and max UV radii of usable visibilities for gridding. uvstat Return UV plane visibility statistics. uvtaper Set a gaussian taper to weight down long baselines and reduce sidelobes uvweight Set the type and degree of weighting for subsequent UV gridding. uvzero Set the estimated flux expected from a baseline of zero length. vplot General visibility plotting and editing command. wbeam Save the dirty beam to a FITS file. wdmap Save the residual dirty map to a FITS file. winmod Delete all components outside (or inside) the current clean windows. wmap Save the clean (restored) map to a FITS file. wmodel Write CLEAN models to a VLBI model file. wobs Save UV data to a random-groups UV FITS file. wtscale Change the scale factor that mutiplies the raw visibility weights. wwins Save CLEAN windows to a text file. xyrange Set the bounds of the sub-image to be displayed in mapplot.