anchor.diff:  
   === Example 3: Multiple Coordinate Systems
   
  -[code,bash]
  +[source,bash]
   ----
   dimensions:
      y = 428;
  
positive.code: You can use any Variable as the Coordinate Transform Variable; here’s an
  example using the vertical Coordinate Axis to hold a vertical transform:
  
  [code,bash]
  ----
  dimensions:
     y = 428;
  
negative.code: to make sure it is interpreted as a Coordinate Transform variable
  instead of a data variable.
  
  [source,bash]
  ----
   int Lambert_Conformal;
    Lambert_Conformal:grid_mapping_name = "lambert_conformal_conic";
  