anchor.diff:        save(slider)
   
   
  -    # We want to know if the user understands that they can slide the slider. Has_moved tracks whether
  -    # they have manipulated it in the past. They might have manipulated it this session, or a previous 
  -    # session. 
  +    # We want to know if the user understands that they can slide the slider. If they don't
  +    # we'll want to display different instructions/feedback. 
  +    # Has_moved tracks whether they have manipulated it in the past. 
  +    # The following code will properly set the value based on whether the stance has been non-zero before,
  +    # either from a previous session or from a slider manipulation this session.
       if !slider.has_moved && slider.stance != 0.0
         slider.has_moved = true
  -
   
       page = @data('root').page_name
       is_auth_mode = @data('root').auth_mode
  
positive.code:       $slider_base.slider(if root.auth_mode then 'disable' else 'enable')
      else
        $slider_base.slider
          disabled: root.auth_mode #@data('root').page_name == 'results'
          min: -1
          max: 1
          step: .01
  
negative.code: 
      R.table 
        className: 'histogram'
        onClick: @onClickHistogram
        # onMouseLeave: @onSelectSegment
        style: { width: effective_histogram_width, marginLeft: margin_adjustment }, 
          R.tr null, 
  