RVF -- Restores virtual frames saved with command SVF
   RVF bframe eframe name
Parameters:
   bframe | beginning frame number to load (def=1)
   eframe | ending frame number to load (def=bframe)
   name   | file name used to save the frames with the SVF command; if an
            extension is not specified, .PIX is automatically appended
Remarks:
   RVF restores the image, graphic, frame directory, navigation, image
   enhancement and graphics table that were present on each of the
   frames when they were saved with command SVF.  However, the graphics
   are embedded into the images.  Therefore, you cannot erase the
   graphics with command EG, turn the graphics color levels on and off
   with command GU ON/OFF, or toggle the graphics on and off with
   command W.

   Virtual frames can only be restored to single-panel frames of the
   same size as the original, and only if the current McIDAS session has
   the same number of image and graphics levels as were present when the
   frames were saved with command SVF.
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