VIEW Keys

    Position-independent actions:
      Press E key: EXIT loop
      Press H key: HELP display
      Press P key: PRINT plot in "ha" subdirectory
      Press Q key: QUIT loop
      Press X key: EXTRACT on disk current zoomed region
      Press N key: Toggle  Narrow - Wide mode

    Cursor on images:
      Left  clic: Display spectrum at pointed position
      Right clic: Define a polygon
      Press B key: BACK to full field of view
      Press C key: COORDINATES toggled from absolute to relative and back
      Press M key: Display MASK if any
      Press S key: SLICE definition (velocity-position)
      Press U key: UNKILL pointed pixel
      Press Z key: ZOOM defined spatial region
      Press V key: Display map coordinates at current position
      Press W key: WRITE Integrated Area image
    Cursor on spectra:
      Left clic in Selected   Spectrum: Display selected velocity channel
      Left clic in Integrated Spectrum: Define velocity range
      Press B key: BACK to full velocity range
      Press C key: COORDINATES toggled from freq/velo to channels and back
      Press L key: LABEL spectral Lines
      Press M key: MOVIE
      Press Z key: ZOOM defined velocity region
      Press W key: WRITE Integrated (and current) Spectrum
    Cursor outside plots:
      Press B key: BACK to full velocity range AND full field of view

    Returned  values  are found in iview%current structure. The ZOOM action pro-
    duces a sub-cube named EXTRACTED.  The SLICE action produces a 2-D data  set
    named  SLICED.  As any other SIC Image variable, EXTRACTED and SLICED can be
    written on disk using command WRITE.