The SHOW command
Keywords: imager

Next: the VIEW command Up: The red VIEWER program Previous: The red VIEWER program Contents Index

### The `SHOW` command

In general, command magenta`SHOW` allows a per-plane display of any SIC 3-D image variable, with contours overlaid on bitmap for each plane: e.g.
`SHOW DIRTY 30 -30` will display contour and bitmaps of each channel of the `DIRTY` image, starting for channel 30 and ending 30 channels before the last one. See Fig. for an example.

Figure: The magenta`SHOW CLEAN` output.

Command magenta`SHOW /SIDE` (and also command magenta`SHOW` when the blue`SHOW_SIDE` variable is set to `YES`) will call the cursor, so that the pixel values at the cursor position are displayed in the `<VSIDE` panel.

A direct use on Gildas 3-D image or UV data files is also possible: magenta`SHOW Filename.ext` will directly display the file if possible. It also works for simple FITS files in which the data array is in the HDU.

For uv data, magenta`SHOW UV` can plot visibility values such as amplitude as a function of time, baseline length, etc..., again on a per channel basis. Fit results can be overlaid, as shown Fig.

Figure: The magenta`SHOW UV` output with results from magenta`UV_FIT` command overlaid.

magenta`SHOW` can also display more specific issues:

- magenta`SHOW CCT` will display the cumulative flux as a function of number of clean components (Fig.).

  Figure: The magenta`SHOW CCT` output.

- magenta`SHOW COVERAGE` will display the uv coverage (it assumes there is only one, and not one per channel, because the display time is long, see Fig.)

  Figure: The magenta`SHOW COVERAGE` output. Colors indicate different dates.

- magenta`SHOW SELFCAL` behaves as magenta`SELFCAL SHOW`
- magenta`SHOW FIELDS` displays the fields of a Mosaic.
- magenta`SHOW NOISE` displays the histogram of the intensity distribution for each channel, estimating the noise by fitting a Gaussian in these histograms (see Fig.).

  Figure: The magenta`SHOW NOISE` output.

- magenta`SHOW UV_FIT` displays the magenta`UV_FIT r`esults for spectral line data.

  Figure: The magenta`SHOW UV_FIT` output.

magenta`SHOW` recognizes many other keywords. See magenta`HELP SHOW` for further details.

Next: the VIEW command Up: The red VIEWER program Previous: The red VIEWER program Contents Index