BAR -- Displays a grayscale bar on a frame containing an image
   BAR frame <keywords>
Parameters:
   frame |  frame number (def=current)
Keywords:
   COLor= | graphics color level for labels (def=3)
   GRA= | graphics frame to display labels (def=current if running
          McIDAS-X with independent graphics;  otherwise def=number
          specified in 'frame' parameter)
   LINt= | label interval; value must be greater than zero (def=computed)
   LSIze= | height of labels, in pixels (def=computed)
   ORIent=VER | bar is displayed vertically (def)
         =HOR | bar is displayed horizontally
   POSition=CUR  | draws bar that fills cursor at its current location
           =line ele short long | user-specified location and size, where:
               line  - starting TV line (def=computed)
               ele - starting TV element (def=computed)
               short - length, in pixels, of the bar's short axis
                       (def=computed)
               long  - length, in pixels, of the bar's long axis
                       (def=computed)
   RANge=min max | range of values to display in the bar (def=computed)
   SU= | name of the stretch table to apply to the grayscale bar
         (def=table specified in IMGDISP command)
Remarks:
   The BAR command displays a grayscale bar and labels.  The bar is
   written to the image so enhancements created with commands EU or EB
   appear on the bar. The labels are written as graphics, so the EG
   command erases the labels but leaves the bar.  The 'frame' parameter
   specifies the frame to write the bar, and the GRA keyword specifies
   the frame to write the labels.

   The POSITION keyword determines the location of the bar.  If you do
   not specify the keyword, the bar is drawn in a vertical orientation
   along the right side of the frame.  If you specify the
   POS=line ele short long    format, 'line' and 'ele' define the TV
   line and element of the upper-left corner of the bar, and 'short'
   and 'long' define the dimensions of the bar.  If using ORIENT=VER,
   'short' is the horizontal length and 'long' is the vertical length.
   If using ORIENT=HOR, 'short' is the vertical length and 'long' is
   the horizontal length.

   If the image was displayed with a stretch table (i.e., IMGDISP with
   SU keyword), the SU and RANGE keywords are ignored.  If the image has
   an auxiliary block (e.g., NIDS radar images), the RANGE keyword is
   ignored and the LINT keyword is valid only if the image was displayed
   with a stretch table.

   The following three rules determine the units of the labels:
     1. If the image was displayed with a stretch table, the label units
        are the same as the calibration units of the stretch table.
     2. If the image has an auxiliary block and was not displayed with
        a stretch table, the label units are the same as the units in
        the auxiliary block.
     3. If the image was not displayed with a stretch table and does
        not have an auxiliary block, the units are the same as the
        calibration units of the stretch table specified in the BAR
        command's SU keyword.  If SU is not specified, the units are
        brightness values.
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