The SHOW command

In general, command 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.2 for an example.

Figure: The SHOW CLEAN output.

Command SHOW /SIDE (and also command SHOW when the 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: 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, 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.3

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

SHOW can also display more specific issues:

• SHOW CCT will display the cumulative flux as a function of number of clean components (Fig.4).

  Figure: The SHOW CCT output.

  
• 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.5)

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

  
• SHOW SELFCAL behaves as SELFCAL SHOW
• SHOW FIELDS displays the fields of a Mosaic.
• SHOW NOISE displays the histogram of the intensity distribution for each channel, estimating the noise by fitting a Gaussian in these histograms (see Fig.6).

  Figure: The SHOW NOISE output.

  
• SHOW UV_FIT displays the UV_FIT results for spectral line data.

  Figure: The SHOW UV_FIT output.

  

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