anchor.diff:          Map
       ),
   
  -    TimeZero = lists:min(Times),
       NodesNumber = orddict:size(Map),
   
       %% Divide each sum by the number of nodes
  -    %% Also subtract `TimeZero` to all times
       orddict:map(
           fun(_Type, List) ->
               lists:map(
                   fun({Time, Sum}) ->
                       case Sum == 0 of
                           true ->
  -                            {Time - TimeZero, Sum};
  +                            {Time, Sum};
                           false ->
  -                            {Time - TimeZero, Sum / NodesNumber}
  +                            {Time, Sum / NodesNumber}
                       end
                   end,
                   List
  
positive.code:     root_plot_dir("transmission.gnuplot").
  
  %% @private
  output_file(PlotDir) ->
      PlotDir ++ "plot.pdf".
  
  %% @private
  only_dirs(Dir) ->
  
negative.code: 
  %% @private
  create_empty_dict_type_to_time_and_bytes(Types, Times) ->
      TimeZero = lists:min(Times),
  
      lists:foldl(
          fun(Type, Map0) ->
              lists:foldl(
                  fun(Time, Map1) ->
                      orddict:append(Type, {Time - TimeZero, 0}, Map1)
                  end,
                  Map0,
                  Times
  