           
           # Get image data
           dataunit.getFrameAsync(0, (arr) =>
+            
             # Compute extent
             [min, max] = dataunit.getExtent(arr)
 

      @wfits.setStretch(@stretch)
  
  updateAlpha: =>
    @wfits.setAlpha(@opts.alpha)
    
  updateQ: =>
    @wfits.setQ(@opts.q)
    
  updateScale: =>
    band = @opts.scale.band

    )
  
  getNextSubject: =>
    @requestChannels()
  
  # Request FITS files for each channel
