anchor.diff:  computeFractalData(ConfigMap) ->
       %% get config needed
       %% create height rows of width columns of pixels
  -    Width           = maps:get(width,ConfigMap),
  -    Height          = maps:get(height,ConfigMap),
  +    Width           = maps:get(width, ConfigMap),
  +    Height          = maps:get(height, ConfigMap),
       %% each pixel has a corresonding complex number defined by corners of the box
  -    XRealRight      = maps:get(xRealRight,ConfigMap),
  -    XRealLeft       = maps:get(xRealLeft,ConfigMap),
  -    YImaginaryLow   = maps:get(yImaginaryLow,ConfigMap),
  -    YImaginaryHigh  = maps:get(yImaginaryHigh,ConfigMap),
  +    XRealRight      = maps:get(xRealRight, ConfigMap),
  +    XRealLeft       = maps:get(xRealLeft, ConfigMap),
  +    YImaginaryLow   = maps:get(yImaginaryLow, ConfigMap),
  +    YImaginaryHigh  = maps:get(yImaginaryHigh, ConfigMap),
       %% box is bounded on left by x > XRealLeft and bounded on right by x < XRealRight
       %% box is bounded on top by y > YImaginaryHigh and bounded on bottom by y > YImaginaryLow
       %% box is width pixels wide and height pixels high
  
positive.code:     NewXR      = XR - DeltaX,                        % decrease XR to the left
      computeFractalDataIntoFile2( NewRowData,
                     NewXPix, NewXR, DeltaX, Width,
                     YPix, YI, DeltaY,Height,
                     ConfigMap).
  
negative.code:     DeltaY = (YImaginaryHigh - YImaginaryLow) / Height,
  
      %% start server
      {ok, Pid} = dataFileSvr:start(ConfigMap),
  
      %% call computeFractalDataIntoFile2/11
      %% writing rows one at a time
  