prefix_name Save UV data, models, windows, the restored map and a command file. EXAMPLE ------- 0>save "3c345" Writing UV FITS file: 3c345.uvf Writing 94 model components to file: 3c345.mod wwins: Wrote 3 windows to 3c345.win Writing map to FITS file: 3c345.fits Writing difmap environment to: 3c345.par 0> PARAMETERS ---------- prefix_name - The prefix to give all the output file names - see the example above. STANDARD SUFFIXES ----------------- To the prefix name that you enter the following extensions are appended to indicate the file type: .uvf - The suffix for the UV FITS data file. .mod - The suffix for any model file. .win - The suffix for any windows file. .fits - The suffix for any restored map fits file. .par - The command-file containing commands to restore the running parameters and data-files into difmap on a later occasion. CONTEXT ------- Before leaving difmap it is important to save all processed data, unless the data is to be discarded. The 'save' command provides a convenient method for saving all relevant data with a single command. It also now saves the running parameters in a command file. 'save' calls the wobs, wmodel, wwins and wmap commands for you where appropriate, to save the UV data, any models, any windows and any restored map that has or can be created. Note that if necessary, when there is a model to restore with, the map will be restored for you. The 'save' command also writes a command file that may be used to restore the files and difmap state at a later date. There are now two methods for reading the data back into difmap at a later date. Originally the 'get' command was provided for this purpose, but the get command could only restore the data files - it did not restore the running parameters. Now the save command has been modified to create an extra file - the .par file. This is a command file that contains commands to restore the data files into difmap AND to restore the running parameters. Thus the preferred method for retrieving the state of difmap at a later date, is to execute this command file. In the example given above a file 3c345.par was created. To restore the files and running parameters at a later date one would type: 0>@3c345.par The response in this case would be somthing like: Reading UV FITS file: 3c345.uvf The integration time appears to be 1.31321 seconds. There appear to be 485 integrations. AN table 1: 485 integrations on 55 of 55 possible baselines. Found source: 3C345 Number of spectral-line channels: 1 IF Freq (Hz) Chan BW (Hz) Full BW (Hz) Sideband 01 1.66299e+09 2e+06 2e+06 USB Polarization(s): RR Read 192 lines of history. Reading an estimated 26675 visibilities. Selecting channels: 1 -> 1, polarization: RR. A total of 94 model components were read from file 3c345.mod rwins: Read 3 windows from 3c345.win New map grid = 256x256 pixels with 0.5x0.5 milli-arcsec cellsize Gaussian UV-taper cancelled UV range cancelled New uniform weighting binwidth=2 pixels Amplitude error weighting cancelled Radial weighting cancelled Zero-baseline flux cancelled Self-cal gaussian UV-taper cancelled Amplitude corrections will not be limited Phase corrections will not be limited The mapplot display area will be limited to: Relative RA: (The whole available range) Relative DEC: (The whole available range) - In phase-only self-cal, good data on baselines that are not in closed arrays of at least 3 telescopes will be flagged. - In amplitude self-cal, good data on baselines that are not in closed arrays of at least 4 telescopes will be flagged. 0> These are the output lines of the various commands that were run from the command file. RELATED COMMANDS ---------------- get - Restore UV data, models and windows from files. wobs - Write the UV data to a UV FITS file. wmodel - Write the CLEAN model to a (text) VLBI model file. wmap - Save the restored map as a FITS file. wbeam - Save the dirty-beam as a FITS file. wwins - Write CLEAN windows to a text file. exit - Exit calls save if so requested.